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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]        
Balance at beginning of period $ 4,158,000 $ 3,842,000 $ 5,451,000 $ 0
Origination of loans held for sale 21,331,000 18,229,000 59,273,000 34,798,000
Reclassification from loans receivable to loans held for sale 0 0 360,000 0
Sales of loans held for sale (20,607,000) (14,268,000) (60,150,000) (26,986,000)
Principal payoffs and amortization (11,000) (46,000) (63,000) (55,000)
Balance at end of period 4,871,000 7,757,000 4,871,000 7,757,000
Real estate loans [Member]        
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]        
Balance at beginning of period 2,067,000 2,568,000 3,323,000 0
Origination of loans held for sale 13,867,000 15,198,000 37,601,000 29,591,000
Reclassification from loans receivable to loans held for sale     360,000  
Sales of loans held for sale (12,199,000) (12,135,000) (37,534,000) (23,953,000)
Principal payoffs and amortization (3,000) (20,000) (18,000) (27,000)
Balance at end of period 3,732,000 5,611,000 3,732,000 5,611,000
Commercial and industrial loans [Member]        
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]        
Balance at beginning of period 2,091,000 1,274,000 2,128,000 0
Origination of loans held for sale 7,464,000 3,031,000 21,672,000 5,207,000
Reclassification from loans receivable to loans held for sale     0  
Sales of loans held for sale (8,408,000) (2,133,000) (22,616,000) (3,033,000)
Principal payoffs and amortization (8,000) (26,000) (45,000) (28,000)
Balance at end of period $ 1,139,000 $ 2,146,000 $ 1,139,000 $ 2,146,000