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)

v3.10.0.1
Loans and Leases - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal $ 2,291 $ 2,877
Non-Accrual TDRs, Deferral of Principal and Interest 3,667 3,884
Non-Accrual TDRs, Reduction of Principal and Interest 868 1,237
Non-Accrual TDRs, Extension of Maturity 448 102
Non-Accrual TDRs, Total 7,274 8,100
Accrual TDRs, Deferral of Principal 3,387 3,415
Accrual Tdrs Deferral Of Principal and Interest 172 182
Accrual TDRs, Reduction of Principal and Interest 1,672 1,998
Accrual TDRs, Extension of Maturity 937 1,664
Accrual TDRs 6,168 7,259
Real estate loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 1,136 1,935
Non-Accrual TDRs, Deferral of Principal and Interest 3,560 3,761
Non-Accrual TDRs, Reduction of Principal and Interest 178 64
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 4,874 5,760
Accrual TDRs, Deferral of Principal 3,387 3,409
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 1,160 1,387
Accrual TDRs, Extension of Maturity 746 1,237
Accrual TDRs 5,293 6,033
Commercial and industrial loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 394 131
Non-Accrual TDRs, Deferral of Principal and Interest 107 123
Non-Accrual TDRs, Reduction of Principal and Interest 690 1,173
Non-Accrual TDRs, Extension of Maturity 448 102
Non-Accrual TDRs, Total 1,639 1,529
Accrual TDRs, Deferral of Principal 0 6
Accrual Tdrs Deferral Of Principal and Interest 172 182
Accrual TDRs, Reduction of Principal and Interest 415 503
Accrual TDRs, Extension of Maturity 191 427
Accrual TDRs 778 1,118
Consumer loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 761 811
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 761 811
Accrual TDRs, Deferral of Principal 0 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 97 108
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs $ 97 $ 108