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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 105,567 $ 199,071
Gross Unrealized Gain 1,980 7,988
Gross Unrealized Loss 3,266 2,804
Fair Value 104,281 204,255
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,786 [1] 53,820
Gross Unrealized Gain   33
Gross Unrealized Loss 460 [1] 1
Fair Value 7,326 [1] 53,852
Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 97,781 145,251
Gross Unrealized Gain 1,980 7,955
Gross Unrealized Loss 2,806 2,803
Fair Value 96,955 150,403
Other Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 583 725
Gross Unrealized Gain 48 70
Fair Value 631 795
Other Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,458 9,444
Gross Unrealized Gain 2  
Gross Unrealized Loss 2,217 2,480
Fair Value 7,243 6,964
Other Securities | Preferred stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 70,866 118,205
Gross Unrealized Gain 1,446 7,415
Gross Unrealized Loss 328 248
Fair Value 71,984 125,372
Other Securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 16,874 [2] 16,877
Gross Unrealized Gain 484 [2] 470
Gross Unrealized Loss 261 [2] 75
Fair Value $ 17,097 [2] $ 17,272
[1] Government-sponsored enterprise.
[2] Primarily consists of mutual funds that are Community Reinvestment Act-qualified investments.