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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 145,256 $ 199,071
Gross Unrealized Gain 9,875 7,988
Gross Unrealized Loss 2,882 2,804
Fair Value 152,249 204,255
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [1]   53,820
Gross Unrealized Gain [1]   33
Gross Unrealized Loss [1]   1
Fair Value [1]   53,852
Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   145,251
Gross Unrealized Gain   7,955
Gross Unrealized Loss   2,803
Fair Value   150,403
Other Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 727 725
Gross Unrealized Gain 73 70
Fair Value 800 795
Other Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,448 9,444
Gross Unrealized Loss 2,607 2,480
Fair Value 6,841 6,964
Other Securities | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 118,205 118,205
Gross Unrealized Gain 9,184 7,415
Gross Unrealized Loss 275 248
Fair Value 127,114 125,372
Other Securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [2] 16,876  
Gross Unrealized Gain [2] 618  
Fair Value [2] $ 17,494  
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.