Guarantees [Abstract] Commercial and similar letters of credit Letters of Credit Outstanding, Amount Goodwill and Intangible Assets Disclosure [Abstract] Goodwill Goodwill Disclosure [Text Block] Earnings Per Share [Abstract] Net income Net Income (Loss) Attributable to Parent Weighted average common shares outstanding – Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Effect of dilutive stock options and restricted stock (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average common shares outstanding – Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Investments, Debt and Equity Securities [Abstract] Investment [Table] Investment [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] U.S. Government agency securities US Government Agencies Debt Securities [Member] Municipal securities US States and Political Subdivisions Debt Securities [Member] U.S. Government-sponsored enterprises (“GSE”) – residential mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] U.S. Government collateralized residential mortgage obligations Residential Mortgage Backed Securities [Member] Corporate debt securities, primarily financial institutions Corporate Debt Securities [Member] Securities Portfolio Without CRA Securities Portfolio Without CRA [Member] Related to securities portfolio without CRA. Community Reinvestment Act (“CRA”) mutual fund CRA Mutual Fund [Member] Related to CRA mutual fund. Investment [Line Items] Investment [Line Items] Securities available-for-sale, amortized cost Available-for-sale Securities, Amortized Cost Basis Securities available-for-sale, gross unrealized gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Securities available-for-sale, gross unrealized losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Securities available for sale Available-for-sale Securities Securities held-to-maturity, amortized cost Held-to-maturity Securities, Current Securities held-to-maturity, gross unrealized gains Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Securities held-to-maturity, gross unrealized losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Securities held to maturity Held-to-maturity Securities, Fair Value Accounting Policies [Abstract] New Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Receivables [Abstract] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial Portfolio Segment Commercial Portfolio Segment [Member] Consumer Portfolio Segment Consumer Portfolio Segment [Member] Unallocated Unallocated Financing Receivables [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Commercial and industrial Commercial and Industrial Loans [Member] Related to commercial and industrial loans. Real estate – construction Construction Real Estate Loans [Member] Related to construction real estate loans. Real estate – commercial Commercial Real Estate Loans [Member] Related to commercial real estate loans. Real estate – residential Residential Real Estate Loans [Member] Related to residential real estate loans. Consumer Consumer Loans [Member] Related to consumer loans. Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Allowance for loan losses Loans and Leases Receivable, Allowance Allowance for loan losses individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Allowance for loan losses collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Total Loans Receivable Loans and Leases Receivable, Gross Loans individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Loans collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Statement of Comprehensive Income [Abstract] Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized holdings gains on securities available for sale, net of income tax expense Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Equity [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] With no related allowance recorded: Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Recorded Investment, Net of Charge-offs Impaired Financing Receivable, with No Related Allowance, Recorded Investment Unpaid Principal Balance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Average Recorded Investment Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, with No Related Allowance, Interest Income, Cash Basis Method With an allowance recorded: Valuation Allowance [Abstract] Recorded Investment, Net of Charge-offs Impaired Financing Receivable, with Related Allowance, Recorded Investment Unpaid Principal Balance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Related Allowance Impaired Financing Receivable, Related Allowance Average Recorded Investment Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method Total: Impaired Financing Receivable, Recorded Investment [Abstract] Recorded Investment, Net of Charge-offs Impaired Financing Receivable, Recorded Investment Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Cash Basis Method Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Retained Earnings Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance (in shares) Shares, Outstanding Beginning Balance Stockholders' Equity Attributable to Parent Common stock dividend – adjustment (in shares) Common Stock Dividends, Shares Other comprehensive income Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Cash dividends on common stock Dividends, Cash Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options exercised Stock Issued During Period, Value, Stock Options Exercised Restricted stock awards (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Common stock repurchased (in shares) Treasury Stock, Shares, Acquired Common stock repurchased Treasury Stock, Value, Acquired, Cost Method Employee stock purchase program (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Employee stock purchase program Stock Issued During Period, Value, Employee Stock Purchase Plan Ending Balance (in shares) Ending Balance Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] (Level 1) Quoted Prices in Active Markets for Identical Assets Fair Value, Inputs, Level 1 [Member] (Level 2) Significant Other Observable Inputs Fair Value, Inputs, Level 2 [Member] (Level 3) Significant Unobservable Inputs Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Securities available for sale Fair Value, Measurements, Nonrecurring Fair Value, Measurements, Nonrecurring [Member] Impaired loans, net of partial charge-offs Impaired loans, net of partial charge-offs The fair value portion of the amount of impaired loans receivable, net of partial charge-offs, reported on the balance sheet at period end. Impaired loans with an allowance recorded Impaired loans with an allowance recorded The fair value portion of the amount of impaired loans receivable, net of allowance recorded, reported on the balance sheet at period end. OREO OREO The fair value portion of land and buildings obtained as of the balance sheet date. Trading Securities [Table] Trading Securities [Table] Corporate Debt Securities, Primarily Financial Institutions Corporate Debt Securities, Primarily Financial Institutions [Member] Related to corporate debt securities, primarily financial institutions. Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] Not Other Than Temporary Impaired Not Other Than Temporary Impaired [Member] Securities that are not other than temporary impaired. Schedule of Trading Securities and Other Trading Assets [Line Items] Schedule of Trading Securities and Other Trading Assets [Line Items] Available for sale securities number of positions sold trcb_AvailableForSaleSecuritiesNumberOfPositionsSold Number of investment positions in available-for-sale investments sold. Proceeds from sales of securities held to maturity Proceeds from Sale of Held-to-maturity Securities Net realized gain on sale of securities held to maturity Held-to-maturity Securities, Sold Security, Realized Gain (Loss) Available-for-sale securities pledged as collateral Available-for-sale Securities Pledged as Collateral Securities in unrealized loss position Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Number of individual trust preferred securities trcb_NumberOfIndividualTrustPreferredSecurities Represents the number of individual trust preferred securities Impaired security amortized cost value Continuous Unrealized Loss 12 Months Or More Amortized Cost This item represents the aggregate amortized cost of investments in debt and equity securities that have been in a continuous unrealized loss position for twelve months or longer. Impaired security fair value Continuous Unrealized Loss 12 Months Or More This item represents the aggregate fair value of investments in debt and equity securities that have been in a continuous unrealized loss position for twelve months or longer. Other than temporary impairments recognized Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Brokers and Dealers [Abstract] Subordinated Borrowing [Table] Subordinated Borrowing [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Subordinated Debt Subordinated Debt [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Subordinated Borrowing [Line Items] Subordinated Borrowing [Line Items] Proceeds from issuance of subordinated long-term debt Proceeds from Issuance of Subordinated Long-term Debt Subordinated borrowing, interest rate Subordinated Borrowing, Interest Rate Variable interest rate Debt Instrument, Basis Spread on Variable Rate Subordinated debt Subordinated Debt Unamortized debt issuance expense Unamortized Debt Issuance Expense Fixed rate note interest rate Debt Instrument, Interest Rate, Effective Percentage Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Banking and Thrift [Abstract] FHLB And Other Borrowings Debt Disclosure [Text Block] Document And Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Offsetting [Abstract] Securities Sold Under Agreements to Repurchase Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Financing Receivable, Allowance for Credit Losses [Roll Forward] Financing Receivable, Allowance for Credit Losses [Roll Forward] Beginning balance Charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Provision Provision for Loan and Lease Losses Ending balance Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-Based Compensation Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Goodwill impairment loss Goodwill, Impaired, Accumulated Impairment Loss Goodwill Goodwill Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Cash dividends on common stock, per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Employee Stock Option Employee Stock Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock dividends, percentage trcb_CommonStockDividendsPercentage Represents percentage of common stock issued as dividends during the period. Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Repurchase Agreements Maturities Schedule of Repurchase Agreements Maturities [Table Text Block] The tabular disclosure of contractual maturities of the Repurchase Agreements. Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Non-accrual loans Financing Receivable, Recorded Investment, Nonaccrual Status Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Unsecured Debt Unsecured Debt [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Federal Fund Borrowing Line Federal Fund Borrowing Line [Member] Related to the federal fund borrowing line. Federal Home Loan Bank Federal Home Loan Bank [Member] Related to the Federal Home Loan Bank. Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Atlantic Community Bankers Bank Atlantic Community Bankers Bank [Member] The legal entity Atlantic Community Bankers Bank. Debt Instrument [Line Items] Debt Instrument [Line Items] Line of credit maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Outstanding borrowings Long-term Debt Line of credit remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Current collateral pledged Pledged Assets Separately Reported, Loans Pledged for Federal Home Loan Bank, at Fair Value FHLB and other borrowings Advances from Federal Home Loan Banks FHLB advances weighted average interest rate Federal Home Loan Bank, Advances, Weighted Average Interest Rate Municipal deposit letters issued by FHLB Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Statement of Financial Position [Abstract] Securities held to maturity, fair value Preferred stock, par value (in dollars per share) Preferred Stock, No Par Value Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, No Par Value Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Treasury stock, shares (in shares) Treasury Stock, Shares Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30-59 Days Past Due Financing Receivables, 30 to 59 Days Past Due [Member] 60-89 Days Past Due Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days & Greater Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Past due Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Loans Receivable 90 Days and Accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Stock repurchase program authorized amount Stock Repurchase Program, Authorized Amount Common stock repurchased (in shares) Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Equity Award [Domain] Restricted Stock Restricted Stock [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum Maximum [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Two River Bancorp 2007 Equity Incentive Plan Two River Bancorp 2007 Equity Incentive Plan [Member] Related to the Two River Bancorp 2007 equity incentive plan. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Shares remaining available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Maximum vesting period for incentive stock options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Option grants awarded to directors or officers (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based compensation expense Allocated Share-based Compensation Expense Unrecognized compensation cost related to non-vested options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Unrecognized compensation cost related to non-vested options, weighted average recognition period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Intrinsic value of options exercised during period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Proceeds from exercise of stock options Proceeds from Stock Options Exercised Tax benefits recognized Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Unrecognized compensation cost related to non-vested restricted stock Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Number of Contracts Financing Receivable, Modifications, Number of Contracts Pre-Modification Outstanding Recorded Investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Post-Modification Outstanding Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Unvested period start (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Restricted stock earned (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Unvested period end (in shares) Weighted Average Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Unvested, weighted average price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Restricted stock earned, weighted average price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Granted, weighted average price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Unvested, weighted average price (in dollars per share) Fair Value Measurements Fair Value Disclosures [Text Block] Income Statement [Abstract] Interest Income Interest and Dividend Income, Operating [Abstract] Loans, including fees Interest and Fee Income, Loans and Leases Securities: Dividend Income, Securities, Operating, by Taxable Status [Abstract] Taxable Interest Income, Securities, Operating, Taxable Tax-exempt Interest Income, Securities, Operating, Tax Exempt Interest-bearing deposits Interest Income, Deposits with Financial Institutions Total Interest Income Interest and Dividend Income, Operating Interest Expense Interest Expense [Abstract] Deposits Interest Expense, Deposits Securities sold under agreements to repurchase Interest Expense, Securities Sold under Agreements to Repurchase FHLB and other borrowings Interest Expense, Borrowings Subordinated debt Interest Expense, Subordinated Notes and Debentures Total Interest Expense Interest Expense Net Interest Income Interest Income (Expense), Net Provision for Loan Losses Net Interest Income after Provision for Loan Losses Interest Income (Expense), after Provision for Loan Loss Non-Interest Income Noninterest Income [Abstract] Service fees on deposit accounts Fees and Commissions, Depositor Accounts Mortgage banking Fees and Commissions, Mortgage Banking Other loan fees Fees and Commissions, Other Earnings from investment in bank owned life insurance Bank Owned Life Insurance Income Death benefit on bank owned life insurance Death Benefit On Bank Owned Life Insurance Death Benefit On Bank Owned Life Insurance Gain on sale of SBA loans Gain (Loss) on Sales of Loans, Net Net gain on sale of securities Gain (Loss) on Sale of Securities, Net Other income Noninterest Income, Other Operating Income Total Non-Interest Income Noninterest Income Non-Interest Expenses Noninterest Expense [Abstract] Salaries and employee benefits Labor and Related Expense Occupancy and equipment Occupancy and equipment Represents cost related to occupancy and equipment. Professional Professional Fees Insurance General Insurance Expense FDIC insurance and assessments Federal Deposit Insurance Corporation Premium Expense Advertising Marketing and Advertising Expense Data processing Information Technology and Data Processing Outside services fees Expense Related to Distribution or Servicing and Underwriting Fees Amortization of identifiable intangibles Amortization of Intangible Assets OREO expenses, impairments and sales, net Other Real Estate, Period Increase (Decrease) Loan workout expenses Loan Portfolio Expense Other operating Other Noninterest Expense Total Non-Interest Expenses Noninterest Expense Income before Income Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net Income Earnings Per Common Share: Basic (in dollars per share) Diluted (in dollars per share) Weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Diluted (in shares) Disclosure of Share-based Compensation Arrangements by Share-based Payment Award Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Unrealized holding gain on securities available for sale, income tax expense Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Earnings Per Common Share Earnings Per Share [Text Block] Subsequent Event Subsequent Events [Text Block] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass Pass [Member] Special Mention Special Mention [Member] Substandard Substandard [Member] Doubtful Doubtful [Member] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Loans Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] Weighted Average Weighted Average [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Impaired Loan Impaired Loan [Member] Related to impaired loans. Other Real Estate Owned Other Real Estate Owned [Member] Related to other real estate owned Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Appraisal Values Appraisal Values [Member] Represents the appraisal value of valuation. Loans which received a discount Fair Value Inputs, Loans With Discounts Fair Value Inputs, Loans With Discounts Discount rate Fair Value Inputs, Discount Rate Liquidation expenses trcb_LiquidationExpensePercentage The qualitative factor percentage of liquidation expenses. Net realized loss on sale of OREO Gains (Losses) on Sales of Other Real Estate OREO Number of loans in foreclosure process Mortgage Loans In Process Of Foreclosure, Number Of Loans Mortgage Loans In Process Of Foreclosure, Number Of Loans Secured mortgage loan, real estate value Mortgage Loans in Process of Foreclosure, Amount Level 3 securities Marketable Securities Discounted cash flow analysis credit spread trcb_FairValueOfSubordinatedDebenturesCreditSpreadOnVariableRate The percentage points added to the reference rate using a discounted cash flow analysis to compute the fair value of subordinated debentures. Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Available for Sale Available-for-sale Securities [Abstract] Due in one year or less, available for sale, amortized cost Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due in one year or less, available for sale, fair value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due in one year through five years, available for sale, amortized cost Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due in one year through five years, available for sale, fair value Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due in five years through ten years, available for sale, amortized cost Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Due in five years through ten years, available for sale, fair value Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after ten years, available for sale, amortized cost Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Due after ten years, available for sale, fair value Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Sub-total, available for sale, amortized cost Available-for-sale Debt Securities, Amortized Cost Basis Sub-total, available for sale, fair value Available-for-sale Securities, Debt Securities Available-for-sale Securities, without single maturity date, amortized cost Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Available-for-sale Securities, without single maturity date, fair value Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Held to Maturity Held-to-maturity Securities [Abstract] Due in one year or less, held to maturity, amortized cost Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount Due in one year or less, held to maturity, fair value Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Due in one year through five years, held to maturity, amortized cost Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount Due in one year through five years, held to maturity, fair value Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value Due in five years through ten years, held to maturity, amortized cost Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount Due in five years through ten years, held to maturity, fair value Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after ten years, held to maturity, amortized cost Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount Due after ten years, held to maturity, fair value Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value Sub-total, held to maturity, amortized cost Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Sub-total, held to maturity, fair value Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value Held-to-maturity Securities, without single maturity date, amortized cost Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount Held-to-maturity Securities, without single maturity date, fair value Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding period start (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Options exercised (in shares) Options forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options outstanding period end (in shares) Weighted Average Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price [Abstract] Options outstanding period start, weighted average price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted, weighted average price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options exercised, weighted average price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options forfeited, weighted average price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options outstanding period end, weighted average price (in dollars per share) Options exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Options exercisable, weighted average price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Options outstanding, weighted average remaining contractual life (Year) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options exercisable, weighted average remaining contractual life (Year) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Options exercisable, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Option price range, lower limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Option price range, upper limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Gain (Loss) on Investments [Table] Schedule of Gain (Loss) on Investments [Table] Gain (Loss) on Investments [Line Items] Gain (Loss) on Investments [Line Items] Less than 12 Months Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 Months Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 Months or More Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 Months or More Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Statement of Cash Flows [Abstract] Cash Flows From Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Amortization and Accretion, Net Intangible amortization Amortization of subordinated debt issuance costs Amortization of Debt Issuance Costs Net amortization of securities premiums and discounts Accretion (Amortization) of Discounts and Premiums, Investments Earnings from investment in bank owned life insurance Proceeds from sale of mortgage loans held for sale Proceeds from Sale of Loans Held-for-sale Origination of mortgage loans held for sale Payments for Origination and Purchases of Loans Held-for-sale Gain on sale of mortgage loans held for sale Gain (Loss) on Sale of Loans and Leases Gain on sale of loans transferred from held for investment to held for sale trcb_GainOnSaleOfLoansTransferredFromHeldForInvestmentToHeldForSale The net gain (loss) resulting from a sale of loans that were transferred from held for investment to held for sale. OREO writedown Impairment of Real Estate Stock-based compensation expense Stock or Unit Option Plan Expense Net realized gain on sale of securities held to maturity Proceeds from sale of SBA loans held for sale Proceeds from Loans Origination of SBA loans held for sale trcb_OriginationOfSmallBusinessAdministrationLoansSold The origination of small business administration loans sold. Gain from sale of SBA loans held for sale Death benefit on bank owned life insurance Increase in assets: Increase (Decrease) in Operating Capital [Abstract] Accrued interest receivable Increase (Decrease) in Interest and Dividends Receivable Other assets Increase (Decrease) in Other Operating Assets Increase (decrease) in liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Accrued interest payable Increase (Decrease) in Accounts Payable and Accrued Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash Flows From Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Purchase of securities available for sale Payments to Acquire Available-for-sale Securities Purchase of securities held to maturity Payments to Acquire Held-to-maturity Securities Proceeds from repayments, calls and maturities of securities available for sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from repayments, calls and maturities of securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from sale of loans transferred from held for investment to held for sale Proceeds from sale of loans transferred from held for investment to held for sale The cash inflow from sales of loans held for sale that were previously held for investment. Net increase in loans Payments for (Proceeds from) Loans and Leases Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Purchase of restricted investments, net Payments to Acquire Restricted Investments Purchase of bank owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Proceeds from death benefit of bank owned life insurance Proceeds from Life Insurance Policy Proceeds from sale of OREO Proceeds from Sale of Foreclosed Assets Net Cash Used In Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Cash Flows From Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Net increase in deposits Increase (Decrease) in Deposits Net increase (decrease) in securities sold under agreements to repurchase Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase Proceeds from FHLB and other borrowings Proceeds from Federal Home Loan Bank Borrowings Repayment of FHLB and other borrowings Repayments of Federal Home Loan Bank Borrowings Cash dividends paid – common stock Payments of Ordinary Dividends, Common Stock Proceeds from employee stock purchase plan Proceeds from Stock Plans Common stock repurchased Payments for Repurchase of Common Stock Net Cash Provided by Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net Increase (Decrease) in Cash and Cash Equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash And Cash Equivalents – Beginning Cash and Cash Equivalents, at Carrying Value Cash And Cash Equivalents - Ending Supplementary cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Income taxes paid Income Taxes Paid Supplemental schedule of non-cash activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Transfer of loans held for investment to loans held for sale Transfer of Portfolio Loans and Leases to Held-for-sale ASSETS Assets [Abstract] Cash and due from banks Cash and Due from Banks Interest-bearing deposits in bank Interest-bearing Deposits in Banks and Other Financial Institutions Cash and cash equivalents Securities held to maturity (fair value of $57,719 and $57,284 at September 30, 2017 and December 31, 2016, respectively) Held-to-maturity Securities Restricted investments, at cost Restricted Investments Loans held for sale Loans Receivable Held-for-sale, Amount Loans Loans and Leases Receivable, Net of Deferred Income Allowance for loan losses Net loans Loans and Leases Receivable, Net Amount Other real estate owned (“OREO”) Real Estate Acquired Through Foreclosure Bank owned life insurance Bank Owned Life Insurance Premises and equipment, net Property, Plant and Equipment, Net Accrued interest receivable Interest Receivable Goodwill Other assets Other Assets Total Assets Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Deposits: Deposits [Abstract] Non-interest-bearing Noninterest-bearing Deposit Liabilities Interest-bearing Interest-bearing Deposit Liabilities Total Deposits Deposits Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase Accrued interest payable Deposit Liabilities, Accrued Interest Other liabilities Other Liabilities Total Liabilities Liabilities Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, no par value; 6,500,000 shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Common stock, no par value; 25,000,000 shares authorized; Issued - 8,766,577 and 8,677,536 at September 30, 2017 and December 31, 2016, respectively Outstanding - 8,454,483 and 8,365,442 at September 30, 2017 and December 31, 2016 Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Treasury stock, at cost; 312,094 shares at September 30, 2017 and December 31, 2016 Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total Shareholders' Equity Total Liabilities and Shareholders’ Equity Liabilities and Equity Components of the Loan Portfolio Held for Investment Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Past Due Financing Receivables Past Due Financing Receivables [Table Text Block] Non-Accrual Loans by Classes of the Loan Portfolio Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Troubled Debt Restructuring Loans Troubled Debt Restructurings on Financing Receivables [Table Text Block] Summarized Information by Impaired Loans by Loan Portfolio Class Impaired Financing Receivables [Table Text Block] Classes of Loan Portfolio Summarized by Aggregate Pass Rating Financing Receivable Credit Quality Indicators [Table Text Block] Schedule of Allowance for Loan Losses Allowance for Credit Losses on Financing Receivables [Table Text Block] Guarantees Guarantees [Text Block] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Class of Financing Receivable, Type of Borrower [Axis] Class of Financing Receivable, Type of Borrower [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type of Borrower [Domain] Non Accrual Loans Non Accrual Loans [Member] Related to non accrual loans. Number loans receivable portfolio segments Number Of Finance Receivable Portfolio Segments Number Of Finance Receivable Portfolio Segments Number of troubled debt restructured contracts Troubled debt restructuring, amount Financing Receivable, Modifications, Recorded Investment Troubled debt restructuring current, amount Financing Receivable Modifications Recorded Investment Current Financing Receivable Modifications Recorded Investment Current Trouble debt restructuring, non-accural loans, amount Financing Receivable Modifications Non-Accrual Status Recorded Investment Financing Receivable Modifications Non-Accrual Status Recorded Investment Trouble debt restructuring, specific reserve Allowance for Credit Losses, Change in Method of Calculating Impairment Loans modified as troubled debt restructuring Financing Receivable, Modifications, Subsequent Default, Number of Contracts Loans Receivable And Allowance For Loan Losses Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Unearned fees Loans and Leases Receivable, Deferred Income Equity Components [Axis] Subordinated Debentures Subordinated Borrowings Disclosure [Text Block] Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Securities Pledged as Collateral Securities Pledged as Collateral [Member] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Securities Sold under Agreements to Repurchase Securities Sold under Agreements to Repurchase [Member] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Overnight and Continuous Maturity Overnight and Continuous [Member] Represents overnight and continuous maturities. Up to 30 days Maturity Less than 30 Days [Member] 30 to 90 days Maturity 30 to 90 Days [Member] Over 90 days Maturity Greater than 90 Days [Member] Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Securities sold under repurchase agreements Secured Borrowings, Gross Including Not Subject to Master Netting Arrangement Gross amount of recognized liabilities for repurchase agreements and securities lending Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Excess of collateral pledged over recognized liability Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Fixed Rate Note, November 2017 Fixed Rate Note 1 [Member] Related to fixed rate note 1 Fixed Rate Note, August 2017 Fixed Rate Note 2 [Member] Related to fixed rate note 2 Fixed Rate Note, October 2017 Fixed Rate Note 3 [Member] Related to fixed rate note 3 Fixed Rate Note, October 2018 Fixed Rate Note 4 [Member] Related to fixed rate note 4 Fixed Rate Note, January 2017 Fixed Rate Note 5 [Member] Related to fixed rate note 5 Fixed Rate Note, January 2018 Fixed Rate Note 6 [Member] Related to fixed rate note 6 Fixed Rate Note, January 2019 Fixed Rate Note 7 [Member] Related to fixed rate note 8 Fixed Rate Note, January 2020 Fixed Rate Note 8 [Member] Related to fixed rate note 8 Fixed Rate Note, January 2021 Fixed Rate Note 9 [Member] Related to fixed rate note 9 Fixed Rate Note, July 2019 Fixed Rate Note 10 [Member] Related to fixed rate note 10 Fixed Rate Note, July 2021 Fixed Rate Note 11 [Member] Related to fixed rate note 11 Fixed Rate Note, August 2022 Fixed Rate Note 13 [Member] Fixed Rate Note 13 [Member] Fixed Rate Note, July 2023 Fixed Rate Note 12 [Member] Represents information pertaining to the 12th fixed rate note. Fixed rate note amount Notes Payable, Noncurrent Fixed rate note term Debt Instrument, Term Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Estimated Fair Value Estimate of Fair Value Measurement [Member] Financial assets: Assets, Fair Value Disclosure [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Restricted investments Restricted Investments, at Fair Value Loans held for sale Loans Held-for-sale, Fair Value Disclosure Loans receivable, net Loans Receivable, Fair Value Disclosure Accrued interest receivable trcb_AccruedInterestReceivableFairValue Fair value portion of accrued interest receivable. Financial liabilities: Financial Liabilities Fair Value Disclosure [Abstract] Deposits Deposits, Fair Value Disclosure Securities sold under agreements to repurchase Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Subordinated debt Subordinated Debt Obligations, Fair Value Disclosure Accrued interest payable trcb_AccruedInterestPayableFairValueDisclosure The fair value portion of accrued interest payable.