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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Feb. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Total, Face Amount	$ 648,893	$ 664,732
Total, Amortized Cost	642,327	657,446
Total, Gross Unrealized Gain	1,149	2,614
Total, Gross Unrealized Loss	(39,046)	(13,718)
Total, Carrying Value/Estimated Fair Value	604,430	646,342
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value Option, Amortized Cost			$ 24,038
Held to Maturity, Face Amount	151,750	153,250
Held to Maturity, Amortized Cost	151,726	153,193
Held to Maturity, Gross Unrealized Gain	0	0
Held to Maturity, Gross Unrealized Loss	0	0
Held to Maturity, Carrying Value/Estimated Fair Value	151,726	153,193
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	497,143	511,482
Fair Value Option, Amortized Cost	490,601	504,253
Fair Value Option, Gross Unrealized Gain	1,149	2,614
Fair Value Option, Gross Unrealized Loss	(39,046)	(13,718)
Fair Value Option, Carrying Value/Estimated Fair Value	$ 452,704	$ 493,149

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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