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Mortgage-Backed and Credit Risk Transfer Securities - Schedule of Fair Value of Available-for-sale Securities and Securities Accounted for under Fair Value Option by Asset Type (Details) link:presentationLink link:calculationLink link:definitionLink 2420402 - Disclosure - Mortgage-Backed and Credit Risk Transfer Securities - Summary of Investment Portfolio (Detail) link:presentationLink link:calculationLink link:definitionLink 2320301 - Disclosure - Mortgage-Backed and Credit Risk Transfer Securities (Tables) link:presentationLink link:calculationLink link:definitionLink 2420407 - Disclosure - Mortgage-Backed and Credit Risk Transfer Securities - Unrealized Losses and Estimated Fair Value of MBS and GSE CRT by Length of Time (Detail) link:presentationLink link:calculationLink link:definitionLink 2165100 - Disclosure - Non-controlling Interest - Operating Partnership link:presentationLink link:calculationLink link:definitionLink 2465402 - Disclosure - Non-controlling Interest - Operating Partnership - 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