Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Allowance for Loan and Lease Losses (Detail)

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Loans and Leases - Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Allowance for loan losses:        
Balance at beginning of period     $ 31,043  
Loan and lease loss provision $ 200 $ 269 949 $ 611
Balance at end of period 31,676   31,676  
Allowance for loan and lease losses [Member]        
Allowance for loan losses:        
Balance at beginning of period 31,818 33,758 31,043 32,429
Charge-offs (1,246) (2,405) (3,535) (3,256)
Recoveries on loans and leases previously charged off 904 871 3,219 2,709
Net charge-offs (342) (1,534) (316) (547)
Loan and lease loss provision 200 268 949 610
Balance at end of period $ 31,676 $ 32,492 $ 31,676 $ 32,492