Annual report pursuant to Section 13 and 15(d)

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

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Loans and Leases - Loans Receivable to Loans Held for Sale (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]      
Balance at beginning of period $ 2,874 $ 5,451  
Origination of loans held for sale 91,367 86,657  
Reclassification from loans receivable to loans held for sale 0 360 $ 0
Sales of loans held for sale (84,901) (89,471)  
Principal payoffs and amortization (24) (123)  
Balance at end of period 9,316 2,874 5,451
Real estate loans [Member]      
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]      
Balance at beginning of period 840 3,323  
Origination of loans held for sale 65,416 56,247  
Reclassification from loans receivable to loans held for sale   360  
Sales of loans held for sale (58,836) (59,030)  
Principal payoffs and amortization (10) (60)  
Balance at end of period 7,410 840 3,323
Commercial and industrial loans [Member]      
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]      
Balance at beginning of period 2,034 2,128  
Origination of loans held for sale 25,951 30,410  
Reclassification from loans receivable to loans held for sale   0  
Sales of loans held for sale (26,065) (30,441)  
Principal payoffs and amortization (14) (63)  
Balance at end of period $ 1,906 $ 2,034 $ 2,128