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
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal $ 2,641 $ 2,877
Non-Accrual TDRs, Deferral of Principal and Interest 3,749 3,884
Non-Accrual TDRs, Reduction of Principal and Interest 898 1,237
Non-Accrual TDRs, Extension of Maturity 467 102
Non-Accrual TDRs, Total 7,755 8,100
Accrual TDRs, Deferral of Principal 3,397 3,415
Accrual Tdrs Deferral Of Principal and Interest 177 182
Accrual TDRs, Reduction of Principal and Interest 1,716 1,998
Accrual TDRs, Extension of Maturity 1,269 1,664
Accrual TDRs 6,559 7,259
Real estate loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 1,467 1,935
Non-Accrual TDRs, Deferral of Principal and Interest 3,642 3,761
Non-Accrual TDRs, Reduction of Principal and Interest 183 64
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 5,292 5,760
Accrual TDRs, Deferral of Principal 3,397 3,409
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 1,171 1,387
Accrual TDRs, Extension of Maturity 1,023 1,237
Accrual TDRs 5,591 6,033
Commercial and industrial loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 399 131
Non-Accrual TDRs, Deferral of Principal and Interest 107 123
Non-Accrual TDRs, Reduction of Principal and Interest 715 1,173
Non-Accrual TDRs, Extension of Maturity 467 102
Non-Accrual TDRs, Total 1,688 1,529
Accrual TDRs, Deferral of Principal 0 6
Accrual Tdrs Deferral Of Principal and Interest 177 182
Accrual TDRs, Reduction of Principal and Interest 443 503
Accrual TDRs, Extension of Maturity 246 427
Accrual TDRs 866 1,118
Consumer loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 775 811
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 775 811
Accrual TDRs, Deferral of Principal 0 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 102 108
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs $ 102 $ 108