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Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total, Face Amount		$ 522,391
Total, Amortized Cost		514,599
Total, Gross Unrealized Gain		292
Total, Gross Unrealized Loss		(37,463)
Total, Carrying Value/Estimated Fair Value		477,428
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Held to Maturity, Face Amount		146,530
Held to Maturity, Amortized Cost		146,352
Held to Maturity, Gross Unrealized Gain		0
Held to Maturity, Gross Unrealized Loss		0
Held to Maturity, Carrying Value/Estimated Fair Value		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	$ 300,064	375,861
Fair Value Option, Amortized Cost	293,312	368,247
Fair Value Option, Gross Unrealized Gain	147	292
Fair Value Option, Gross Unrealized Loss	(38,975)	(37,463)
Fair Value Option, Carrying Value/Estimated Fair Value	$ 254,484	$ 331,076

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