000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Consolidated Balance Sheets link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Consolidated Balance Sheets (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Consolidated Statements of Income link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Condensed Consolidated Statements of Comprehensive Income link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Consolidated Statements of Changes in Shareholders' Equity link:calculationLink link:definitionLink link:presentationLink 006 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 007 - Statement - Consolidated Statements of Cash Flows link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 1 - Summary of Significant Accounting Policies link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 2 - Business Combination link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 3 - Securities link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 4 - Loans and Allowance for Loan Losses link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 5 - Premises and Equipment, Net link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 6 - Mortgage Loan Servicing link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 7 - Core Deposit Intangible Assets, Net link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 8 - Deposits link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 10 - Federal Home Loan Bank Advances link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 11 - Federal Income Taxes link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 12 - Stock-based Compensation link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 13 - Related Parties link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 14 - Commitments and Off-Balance Sheet Risk link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 15 - Benefit Plans link:calculationLink link:definitionLink link:presentationLink 023 - Disclosure - Note 16 - Hedging Activities link:calculationLink link:definitionLink link:presentationLink 024 - Disclosure - Note 17 - Fair Values of Financial Instruments link:calculationLink link:definitionLink link:presentationLink 025 - Disclosure - Note 18 - Fair Value Measurements link:calculationLink link:definitionLink link:presentationLink 026 - Disclosure - Note 19 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 027 - Disclosure - Note 20 - Subordinated Debentures link:calculationLink link:definitionLink link:presentationLink 028 - Disclosure - Note 21 - Regulatory Matters link:calculationLink link:definitionLink link:presentationLink 029 - Disclosure - Note 22 - Accumulated Other Comprehensive Income (Loss) link:calculationLink link:definitionLink link:presentationLink 030 - Disclosure - Note 23 - Quarterly Financial Data (Unaudited) link:calculationLink link:definitionLink link:presentationLink 031 - Disclosure - Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements link:calculationLink link:definitionLink link:presentationLink 032 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 033 - Disclosure - Note 1 - Summary of Significant Accounting Policies (Tables) link:calculationLink link:definitionLink link:presentationLink 034 - Disclosure - Note 3 - Securities (Tables) link:calculationLink link:definitionLink link:presentationLink 035 - Disclosure - Note 4 - Loans and Allowance for Loan Losses (Tables) link:calculationLink link:definitionLink link:presentationLink 036 - Disclosure - Note 5 - Premises and Equipment, Net (Tables) link:calculationLink link:definitionLink link:presentationLink 037 - Disclosure - Note 6 - Mortgage Loan Servicing (Tables) link:calculationLink link:definitionLink link:presentationLink 038 - Disclosure - Note 7 - Core Deposit Intangible Assets, Net (Tables) link:calculationLink link:definitionLink link:presentationLink 039 - Disclosure - Note 8 - Deposits (Tables) link:calculationLink link:definitionLink link:presentationLink 040 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase (Tables) link:calculationLink link:definitionLink link:presentationLink 041 - Disclosure - Note 10 - Federal Home Loan Bank Advances (Tables) link:calculationLink link:definitionLink link:presentationLink 042 - Disclosure - Note 11 - Federal Income Taxes (Tables) link:calculationLink link:definitionLink link:presentationLink 043 - Disclosure - Note 12 - Stock-based Compensation (Tables) link:calculationLink link:definitionLink link:presentationLink 044 - Disclosure - Note 13 - Related Parties (Tables) link:calculationLink link:definitionLink link:presentationLink 045 - Disclosure - Note 14 - Commitments and Off-Balance Sheet Risk (Tables) link:calculationLink link:definitionLink link:presentationLink 046 - Disclosure - Note 17 - Fair Values of Financial Instruments (Tables) link:calculationLink link:definitionLink link:presentationLink 047 - Disclosure - Note 18 - Fair Value Measurements (Tables) link:calculationLink link:definitionLink link:presentationLink 048 - Disclosure - Note 19 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 049 - Disclosure - Note 20 - Subordinated Debentures (Tables) link:calculationLink link:definitionLink link:presentationLink 050 - Disclosure - Note 21 - Regulatory Matters (Tables) link:calculationLink link:definitionLink link:presentationLink 051 - Disclosure - Note 23 - Quarterly Financial Data (Unaudited) (Tables) link:calculationLink link:definitionLink link:presentationLink 052 - Disclosure - Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Tables) link:calculationLink link:definitionLink link:presentationLink 053 - Disclosure - Note 1 - Summary of Significant Accounting Policies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 054 - Disclosure - Note 1 - Summary of Significant Accounting Policies - Year-end Mortgage Loans Held for Sale (Details) link:calculationLink link:definitionLink link:presentationLink 055 - Disclosure - Note 2 - Business Combination (Details Textual) link:calculationLink link:definitionLink link:presentationLink 056 - Disclosure - Note 3 - Securities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 057 - Disclosure - Note 3 - Securities - Available-for-sale Securities (Details) link:calculationLink link:definitionLink link:presentationLink 058 - Disclosure - Note 3 - Securities - Securities in a Continuous Loss Position (Details) link:calculationLink link:definitionLink link:presentationLink 059 - Disclosure - Note 3 - Securities - Debt Securities by Maturity (Details) link:calculationLink link:definitionLink link:presentationLink 060 - Disclosure - Note 4 - Loans and Allowance for Loan Losses (Details Textual) link:calculationLink link:definitionLink link:presentationLink 061 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Components of Loan Portfolio (Details) link:calculationLink link:definitionLink link:presentationLink 062 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Acquired Impaired Loans Accretable Yield (Details) link:calculationLink link:definitionLink link:presentationLink 063 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Concentrations Within the Loan Portfolio (Details) link:calculationLink link:definitionLink link:presentationLink 064 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Nonperforming Loans (Details) link:calculationLink link:definitionLink link:presentationLink 065 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) link:calculationLink link:definitionLink link:presentationLink 066 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Impaired Loans (Details) link:calculationLink link:definitionLink link:presentationLink 067 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Loans by Credit Quality Indicators (Details) link:calculationLink link:definitionLink link:presentationLink 068 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Retail Credit Exposure (Details) link:calculationLink link:definitionLink link:presentationLink 069 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Details) link:calculationLink link:definitionLink link:presentationLink 070 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Details) link:calculationLink link:definitionLink link:presentationLink 071 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Loans Modified As Troubled Debt Restructurings Within the Previous Twelve Months That Became Over 30 Days Past Due (Details) link:calculationLink link:definitionLink link:presentationLink 072 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Activity for Troubled Debt Restructurings (Details) link:calculationLink link:definitionLink link:presentationLink 073 - Disclosure - Note 4 - Loans and Allowance for Loan Losses - Allowance Related to Troubled Debt Restructurings (Details) link:calculationLink link:definitionLink link:presentationLink 074 - Disclosure - Note 5 - Premises and Equipment, Net (Details Textual) link:calculationLink link:definitionLink link:presentationLink 075 - Disclosure - Note 5 - Premises and Equipment, Net - Summary of Premises and Equipment (Details) link:calculationLink link:definitionLink link:presentationLink 076 - Disclosure - Note 6 - Mortgage Loan Servicing (Details Textual) link:calculationLink link:definitionLink link:presentationLink 077 - Disclosure - Note 6 - Mortgage Loan Servicing - Mortgage Loans Serviced for Others (Details) link:calculationLink link:definitionLink link:presentationLink 078 - Disclosure - Note 6 - Mortgage Loan Servicing - Activity for Capitalized Mortgage Loan Servicing Rights (Details) link:calculationLink link:definitionLink link:presentationLink 079 - Disclosure - Note 6 - Mortgage Loan Servicing - Estimated Amortization (Details) link:calculationLink link:definitionLink link:presentationLink 080 - Disclosure - Note 7 - Core Deposit Intangible Assets, Net (Details Textual) link:calculationLink link:definitionLink link:presentationLink 081 - Disclosure - Note 7 - Core Deposit Intangible Assets, Net - Estimated Amortization Expense on Core Deposit Intangible Assets (Details) link:calculationLink link:definitionLink link:presentationLink 082 - Disclosure - Note 8 - Deposits (Details Textual) link:calculationLink link:definitionLink link:presentationLink 083 - Disclosure - Note 8 - Deposits - Summary of Deposits (Details) link:calculationLink link:definitionLink link:presentationLink 084 - Disclosure - Note 8 - Deposits - Maturity Distribution for Certificate of Deposits (Details) link:calculationLink link:definitionLink link:presentationLink 085 - Disclosure - Note 8 - Deposits - Certificates of Deposit with Balances of $100,000 or More (Details) link:calculationLink link:definitionLink link:presentationLink 086 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase (Details Textual) link:calculationLink link:definitionLink link:presentationLink 087 - Disclosure - Note 9 - Securities Sold Under Agreements to Repurchase - Securities Sold Under Agreement to Repurchase (Details) link:calculationLink link:definitionLink link:presentationLink 088 - Disclosure - Note 10 - Federal Home Loan Bank Advances (Details Textual) link:calculationLink link:definitionLink link:presentationLink 089 - Disclosure - Note 10 - Federal Home Loan Bank Advances - Maturities of Currently Outstanding FHLB Advances (Details) link:calculationLink link:definitionLink link:presentationLink 090 - Disclosure - Note 11 - Federal Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 091 - Disclosure - Note 11 - Federal Income Taxes - Consolidated Income Tax Expense (Details) link:calculationLink link:definitionLink link:presentationLink 092 - Disclosure - Note 11 - Federal Income Taxes - Effective Income Tax Rate Reconciliation (Details) link:calculationLink link:definitionLink link:presentationLink 093 - Disclosure - Note 11 - Federal Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) link:calculationLink link:definitionLink link:presentationLink 094 - Disclosure - Note 12 - Stock-based Compensation (Details Textual) link:calculationLink link:definitionLink link:presentationLink 095 - Disclosure - Note 12 - Stock-based Compensation - Summary of Restricted Stock Activity (Details) link:calculationLink link:definitionLink link:presentationLink 096 - Disclosure - Note 12 - Stock-based Compensation - Summary of Stock Option Activity (Details) link:calculationLink link:definitionLink link:presentationLink 097 - Disclosure - Note 12 - Stock-based Compensation - Stock Option Valuation Assumptions (Details) link:calculationLink link:definitionLink link:presentationLink 098 - Disclosure - Note 12 - Stock-based Compensation - Summary of Options Outstanding (Details) link:calculationLink link:definitionLink link:presentationLink 099 - Disclosure - Note 12 - Stock-based Compensation - Summary of Information Related to Options Outstanding (Details) link:calculationLink link:definitionLink link:presentationLink 100 - Disclosure - Note 12 - Stock-based Compensation - Summary of Stock Option Grants and Exercises (Details) link:calculationLink link:definitionLink link:presentationLink 101 - Disclosure - Note 13 - Related Parties (Details Textual) link:calculationLink link:definitionLink link:presentationLink 102 - Disclosure - Note 13 - Related Parties - Loans Outstanding to Directors and Executive Officers (Details) link:calculationLink link:definitionLink link:presentationLink 103 - Disclosure - Note 14 - Commitments and Off-Balance Sheet Risk (Details Textual) link:calculationLink link:definitionLink link:presentationLink 104 - Disclosure - Note 14 - Commitments and Off-Balance Sheet Risk - Exposure to Credit Losses (Details) link:calculationLink link:definitionLink link:presentationLink 105 - Disclosure - Note 14 - Commitments and Off-balance-sheet Risk - Instruments Carried at Fair Values (Details) link:calculationLink link:definitionLink link:presentationLink 106 - Disclosure - Note 15 - Benefit Plans (Details Textual) link:calculationLink link:definitionLink link:presentationLink 107 - Disclosure - Note 16 - Hedging Activities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 108 - Disclosure - Note 17 - Fair Values of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) link:calculationLink link:definitionLink link:presentationLink 109 - Disclosure - Note 18 - Fair Value Measurements (Details Textual) link:calculationLink link:definitionLink link:presentationLink 110 - Disclosure - Note 18 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) link:calculationLink link:definitionLink link:presentationLink 111 - Disclosure - Note 18 - Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) link:calculationLink link:definitionLink link:presentationLink 112 - Disclosure - Note 19 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 113 - Disclosure - Note 19 - Earnings Per Share - Computation of Earnings Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 114 - Disclosure - Note 20 - Subordinated Debentures (Details Textual) link:calculationLink link:definitionLink link:presentationLink 115 - Disclosure - Note 20 - Subordinated Debentures - Business Trusts (Details) link:calculationLink link:definitionLink link:presentationLink 116 - Disclosure - Note 21 - Regulatory Matters (Details Textual) link:calculationLink link:definitionLink link:presentationLink 117 - Disclosure - Note 21 - Regulatory Matters - Actual Capital Levels and Minimum Levels (Details) link:calculationLink link:definitionLink link:presentationLink 118 - Disclosure - Note 22 - Accumulated Other Comprehensive Income (Loss) (Details Textual) link:calculationLink link:definitionLink link:presentationLink 119 - Disclosure - Note 23 - Quarterly Financial Data (Unaudited) (Details Textual) link:calculationLink link:definitionLink link:presentationLink 120 - Disclosure - Note 23 - Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Unaudited) (Details) link:calculationLink link:definitionLink link:presentationLink 121 - Disclosure - Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Balance Sheets (Details) link:calculationLink link:definitionLink link:presentationLink 122 - Disclosure - Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statements of Income (Details) link:calculationLink link:definitionLink link:presentationLink 123 - Disclosure - Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statement of Cash Flows (Details) link:calculationLink link:definitionLink link:presentationLink