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, 2018
Dec. 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 79,146 109,111
Sales (75,951) (111,977)
Principal payoffs and amortization (199) (56)
Balance at end of period 9,390 6,394
Real estate loans    
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]    
Balance at beginning of period 3,746 7,410
Originations 39,243 70,710
Sales (37,790) (74,344)
Principal payoffs and amortization (5) (30)
Balance at end of period 5,194 3,746
Commercial and industrial loans    
Financing Receivable, Reclassification From Portfolio Loans To Loans Held For Sale [Roll Forward]    
Balance at beginning of period 2,648 1,906
Originations 39,903 38,401
Sales (38,161) (37,633)
Principal payoffs and amortization (194) (26)
Balance at end of period $ 4,196 $ 2,648