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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Aug. 31, 2016	Dec. 31, 2015	Feb. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Total, Face Amount	$ 549,672		$ 664,732
Total, Amortized Cost	542,350		657,446
Total, Gross Unrealized Gain	116		2,614
Total, Gross Unrealized Loss	(47,820)		(13,718)
Total, Carrying Value/Estimated Fair Value	494,646		646,342
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value Option, Amortized Cost		$ 86,676		$ 24,038
Held to Maturity, Face Amount	147,280		153,250
Held to Maturity, Amortized Cost	147,190		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	147,190		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	402,392		511,482
Fair Value Option, Amortized Cost	395,160		504,253
Fair Value Option, Gross Unrealized Gain	116		2,614
Fair Value Option, Gross Unrealized Loss	(47,820)		(13,718)
Fair Value Option, Carrying Value/Estimated Fair Value	$ 347,456		$ 493,149

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Available-for-sale Debt Securities, Face Amount

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Available-for-sale Securities and Held-to-maturity Securities, Accumulated Gross Unrealized Gain, before Tax

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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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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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