Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail)

v3.8.0.1
Loans and Leases - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal $ 2,911 $ 1,828
Non-Accrual TDRs, Deferral of Principal and Interest 4,022 4,444
Non-Accrual TDRs, Reduction of Principal and Interest 115 212
Non-Accrual TDRs, Extension of Maturity 109 419
Non-Accrual TDRs, Total 7,157 6,903
Accrual TDRs, Deferral of Principal 3,399 4,817
Accrual Tdrs Deferral Of Principal and Interest 184 198
Accrual TDRs, Reduction of Principal and Interest 3,177 3,768
Accrual TDRs, Extension of Maturity 1,730 2,363
Accrual TDRs 8,490 11,146
Real estate loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 1,959 1,679
Non-Accrual TDRs, Deferral of Principal and Interest 3,836 4,373
Non-Accrual TDRs, Reduction of Principal and Interest 67 143
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 5,862 6,195
Accrual TDRs, Deferral of Principal 3,389 4,795
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 1,399 1,514
Accrual TDRs, Extension of Maturity 1,245 1,633
Accrual TDRs 6,033 7,942
Commercial and industrial loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 132 149
Non-Accrual TDRs, Deferral of Principal and Interest 186 71
Non-Accrual TDRs, Reduction of Principal and Interest 48 69
Non-Accrual TDRs, Extension of Maturity 109 419
Non-Accrual TDRs, Total 475 708
Accrual TDRs, Deferral of Principal 10 22
Accrual Tdrs Deferral Of Principal and Interest 184 198
Accrual TDRs, Reduction of Principal and Interest 1,667 2,135
Accrual TDRs, Extension of Maturity 485 730
Accrual TDRs 2,346 3,085
Consumer loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 820 0
Non-Accrual TDRs, Deferral of Principal and Interest 0 0
Non-Accrual TDRs, Reduction of Principal and Interest 0 0
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 820 0
Accrual TDRs, Deferral of Principal 0 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 111 119
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs $ 111 $ 119