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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 199,071 $ 168,770
Gross Unrealized Gain 7,988 7,476
Gross Unrealized Loss 2,804 2,463
Fair Value 204,255 173,783
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 53,820 [1] 18,350
Gross Unrealized Gain 33 [1] 1,350
Gross Unrealized Loss [1] 1  
Fair Value 53,852 [1] 19,700
Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 145,251 150,420
Gross Unrealized Gain 7,955 6,126
Gross Unrealized Loss 2,803 2,463
Fair Value 150,403 154,083
Other Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 725 841
Gross Unrealized Gain 70 101
Fair Value 795 942
Other Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,444 13,431
Gross Unrealized Gain   31
Gross Unrealized Loss 2,480 1,980
Fair Value 6,964 11,482
Other Securities | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 118,205 118,205
Gross Unrealized Gain 7,415 5,246
Gross Unrealized Loss 248 440
Fair Value 125,372 123,011
Other Securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [2] 16,877  
Gross Unrealized Gain [2] 470  
Gross Unrealized Loss [2] 75  
Fair Value [2] $ 17,272  
Other Securities | Common stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   17,943
Gross Unrealized Gain   748
Gross Unrealized Loss   43
Fair Value   $ 18,648
[1] Government-sponsored enterprise.
[2] Primarily consists of mutual funds that are Community Reinvestment Act-qualified investments.