Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Activity for SBA Loans Held for Sale (Detail)

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Loans and Leases - Activity for SBA Loans Held for Sale (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]    
Balance at beginning of period $ 6,394 $ 9,316
Originations 18,805 19,192
Sales (19,187) (19,643)
Principal payoffs and amortization (4) (16)
Balance at end of period 6,008 8,849
Real estate loans [Member]    
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]    
Balance at beginning of period 3,746 7,410
Originations 10,433 12,633
Sales (12,028) (12,254)
Principal payoffs and amortization 0 0
Balance at end of period 2,151 7,789
Commercial and industrial loans [Member]    
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]    
Balance at beginning of period 2,648 1,906
Originations 8,372 6,559
Sales (7,159) (7,389)
Principal payoffs and amortization (4) (16)
Balance at end of period $ 3,857 $ 1,060