Summary of Portfolio of Securities Available for Sale (Detail) - USD ($) $ in Thousands		Sep. 30, 2016		Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 153,092		$ 199,071
Gross Unrealized Gain		10,542		7,988
Gross Unrealized Loss		2,489		2,804
Fair Value		161,145		204,255
Mortgage-Related Securities | GSE certificates
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		7,824	[1]	53,820
Gross Unrealized Gain		3	[1]	33
Gross Unrealized Loss				1
Fair Value		7,827	[1]	53,852
Other Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		145,268		145,251
Gross Unrealized Gain		10,539		7,955
Gross Unrealized Loss		2,489		2,803
Fair Value		153,318		150,403
Other Securities | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		731		725
Gross Unrealized Gain		68		70
Fair Value		799		795
Other Securities | Capital trust notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		9,455		9,444
Gross Unrealized Gain		2
Gross Unrealized Loss		2,481		2,480
Fair Value		6,976		6,964
Other Securities | Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		118,205		118,205
Gross Unrealized Gain		9,782		7,415
Gross Unrealized Loss		8		248
Fair Value		127,979		125,372
Other Securities | Mutual Funds and Common Stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	[2]	16,877
Gross Unrealized Gain	[2]	687
Fair Value	[2]	$ 17,564
Other Securities | Common stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost				16,877
Gross Unrealized Gain				470
Gross Unrealized Loss				75
Fair Value				$ 17,272

[1] Government-sponsored enterprise.

[2] Primarily consists of mutual funds that are Community Reinvestment Act-qualified investments.