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, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]      
Balance at beginning of period $ 9,316 $ 2,874  
Origination of loans held for sale 109,111 91,367  
Reclassification from loans receivable to loans held for sale 0 0 $ 360
Sales of loans held for sale (111,977) (84,901)  
Principal payoffs and amortization (56) (24)  
Balance at end of period 6,394 9,316 2,874
Real estate loans [Member]      
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]      
Balance at beginning of period 7,410 840  
Origination of loans held for sale 70,710 65,416  
Sales of loans held for sale (74,344) (58,836)  
Principal payoffs and amortization (30) (10)  
Balance at end of period 3,746 7,410 840
Commercial and industrial loans [Member]      
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]      
Balance at beginning of period 1,906 2,034  
Origination of loans held for sale 38,401 25,951  
Sales of loans held for sale (37,633) (26,065)  
Principal payoffs and amortization (26) (14)  
Balance at end of period $ 2,648 $ 1,906 $ 2,034