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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Allowance for loan losses:        
Balance at beginning of period     $ 31,043  
Loan and lease loss provision $ 100 $ 422 749 $ 342
Balance at end of period 31,818   31,818  
Allowance for loan and lease losses [Member]        
Allowance for loan losses:        
Balance at beginning of period 31,777 33,152 31,043 32,429
Charge-offs (657) (665) (2,289) (851)
Recoveries on loans and leases previously charged off 598 849 2,315 1,838
Net (charge-offs) recoveries (59) 184 26 987
Loan and lease loss provision 100 422 749 342
Balance at end of period $ 31,818 $ 33,758 $ 31,818 $ 33,758