Quarterly report pursuant to Section 13 or 15(d)

Loans - Loans Receivable to Loans Held for Sale (Detail)

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Loans - Loans Receivable to Loans Held for Sale (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]        
Balance at beginning of period $ 8,677,000 $ 390,000 $ 5,451,000 $ 0
Origination of loans held for sale 14,834,000 10,215,000 37,942,000 16,569,000
Reclassification from loans receivable to loans held for sale 360,000 0 360,000 0
Sales of loans held for sale (19,689,000) (6,759,000) (39,543,000) (12,717,000)
Principal payoffs and amortization (24,000) (4,000) (52,000) (10,000)
Balance at end of period 4,158,000 3,842,000 4,158,000 3,842,000
Real estate loans [Member]        
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]        
Balance at beginning of period 7,226,000 390,000 3,323,000 0
Origination of loans held for sale 6,807,000 8,124,000 23,734,000 14,393,000
Reclassification from loans receivable to loans held for sale 360,000   360,000  
Sales of loans held for sale (12,321,000) (5,944,000) (25,335,000) (11,818,000)
Principal payoffs and amortization (5,000) (2,000) (15,000) (7,000)
Balance at end of period 2,067,000 2,568,000 2,067,000 2,568,000
Commercial and industrial loans [Member]        
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]        
Balance at beginning of period 1,451,000 0 2,128,000 0
Origination of loans held for sale 8,027,000 2,091,000 14,208,000 2,176,000
Reclassification from loans receivable to loans held for sale 0   0  
Sales of loans held for sale (7,368,000) (815,000) (14,208,000) (899,000)
Principal payoffs and amortization (19,000) (2,000) (37,000) (3,000)
Balance at end of period $ 2,091,000 $ 1,274,000 $ 2,091,000 $ 1,274,000