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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Feb. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Total, Face Amount	$ 657,634	$ 664,732
Total, Amortized Cost	651,081	657,446
Total, Gross Unrealized Gain	1,575	2,614
Total, Gross Unrealized Loss	(27,741)	(13,718)
Total, Carrying Value	624,915	646,342
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost			$ 24,038
Held to Maturity, Face Amount	152,500	153,250
Held to Maturity, Amortized Cost	152,451	153,193
Held to Maturity, Gross Unrealized Gain	0	0
Held to Maturity, Gross Unrealized Loss	0	0
Held to Maturity, Carrying Value	152,451	153,193
Commercial Mortgage Backed Securities [Member] | Estimated Fair Value [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Face Amount	505,134	511,482
Amortized cost	498,630	504,253
Gross Unrealized Gain	1,575	2,614
Gross Unrealized Loss	(27,741)	(13,718)
Carrying Value/Estimated Fair Value	$ 472,464	$ 493,149

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