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Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Total, Face Amount | $ 450,548 | $ 522,391
Total, Amortized Cost | 441,939 | 514,599
Total, Gross Unrealized Gain | 1,833 | 292
Total, Gross Unrealized Loss | (36,151) | (37,463)
Total, Carrying Value/Estimated Fair Value | 407,621 | 477,428
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held to Maturity, Face Amount | 145,780 | 146,530
Held to Maturity, Amortized Cost | 145,780 | 146,352
Held to Maturity, Gross Unrealized Gain | 0 | 0
Held to Maturity, Gross Unrealized Loss | 0 | 0
Held to Maturity, Carrying Value/Estimated Fair Value | 145,780 | 146,352
Commercial Mortgage Backed Securities [Member] | Estimated Fair Value [Member] | Available-for-sale Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value Option, Face Amount | 304,768 | 375,861
Fair Value Option, Amortized Cost | 296,159 | 368,247
Fair Value Option, Gross Unrealized Gain | 1,833 | 292
Fair Value Option, Gross Unrealized Loss | (36,151) | (37,463)
Fair Value Option, Carrying Value/Estimated Fair Value | $ 261,841 | $ 331,076

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