Summary of Portfolio of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2015		Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 159,636		$ 168,770
Gross Unrealized Gain	6,499		7,476
Gross Unrealized Loss	3,809		2,463
Fair Value	162,326		173,783
Mortgage-Related Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,203		18,350
Gross Unrealized Gain	1,107		1,350
Fair Value	14,310		19,700
Mortgage-Related Securities | GSE certificates
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,203	[1]	18,350
Gross Unrealized Gain	1,107	[1]	1,350
Fair Value	14,310	[1]	19,700
Other Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	146,433		150,420
Gross Unrealized Gain	5,392		6,126
Gross Unrealized Loss	3,809		2,463
Fair Value	148,016		154,083
Other Securities | Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	848		841
Gross Unrealized Gain	76		101
Fair Value	924		942
Other Securities | Capital trust notes
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,441		13,431
Gross Unrealized Gain			31
Gross Unrealized Loss	2,692		1,980
Fair Value	6,749		11,482
Other Securities | Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	118,205		118,205
Gross Unrealized Gain	4,664		5,246
Gross Unrealized Loss	1,088		440
Fair Value	121,781		123,011
Other Securities | Mutual Funds and Common Stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,939	[2]	17,943
Gross Unrealized Gain	652	[2]	748
Gross Unrealized Loss	29	[2]	43
Fair Value	$ 18,562	[2]	$ 18,648

[1] Government-sponsored enterprise.

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