Loans - Risk Rating (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Multi-Family Residential Real Estate [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating $ 288,172 $ 178,948
Multi-Family Residential Real Estate [Member] | Loans Rated 1 - 3A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 275,711 164,370
Multi-Family Residential Real Estate [Member] | Loans Rated 4 - 4A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 1,665 8,455
Multi-Family Residential Real Estate [Member] | Loans Rated 5 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 10,796 6,123
Multi-Family Residential Real Estate [Member] | Loans Rated 6 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating      
Multi-Family Residential Real Estate [Member] | Loans Rated 7 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating      
Commercial Real Estate [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 1,032,408 795,642
Commercial Real Estate [Member] | Loans Rated 1 - 3A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 1,015,172 773,844
Commercial Real Estate [Member] | Loans Rated 4 - 4A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 4,315 10,216
Commercial Real Estate [Member] | Loans Rated 5 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 12,921 11,582
Commercial Real Estate [Member] | Loans Rated 6 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating      
Commercial Real Estate [Member] | Loans Rated 7 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating      
Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 208,799 173,255
Construction [Member] | Loans Rated 1 - 3A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 178,980 125,418
Construction [Member] | Loans Rated 4 - 4A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating   29,551
Construction [Member] | Loans Rated 5 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 29,819 18,286
Construction [Member] | Loans Rated 6 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating      
Construction [Member] | Loans Rated 7 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating      
Commercial Business Loans [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 247,005 147,814
Commercial Business Loans [Member] | Loans Rated 1 - 3A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 245,646 145,676
Commercial Business Loans [Member] | Loans Rated 4 - 4A [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 4 1,582
Commercial Business Loans [Member] | Loans Rated 5 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating 1,355 556
Commercial Business Loans [Member] | Loans Rated 6 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating      
Commercial Business Loans [Member] | Loans Rated 7 [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable Credit Quality Rating