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
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal $ 2,396 $ 2,877
Non-Accrual TDRs, Deferral of Principal and Interest 3,816 3,884
Non-Accrual TDRs, Reduction of Principal and Interest 755 1,237
Non-Accrual TDRs, Extension of Maturity 484 102
Non-Accrual TDRs, Total 7,451 8,100
Accrual TDRs, Deferral of Principal 3,408 3,415
Accrual Tdrs Deferral Of Principal and Interest 177 182
Accrual TDRs, Reduction of Principal and Interest 1,931 1,998
Accrual TDRs, Extension of Maturity 1,599 1,664
Accrual TDRs 7,115 7,259
Real estate loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 1,479 1,935
Non-Accrual TDRs, Deferral of Principal and Interest 3,709 3,761
Non-Accrual TDRs, Reduction of Principal and Interest 15 64
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 5,203 5,760
Accrual TDRs, Deferral of Principal 3,408 3,409
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 1,356 1,387
Accrual TDRs, Extension of Maturity 1,230 1,237
Accrual TDRs 5,994 6,033
Commercial and industrial loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 128 131
Non-Accrual TDRs, Deferral of Principal and Interest 107 123
Non-Accrual TDRs, Reduction of Principal and Interest 740 1,173
Non-Accrual TDRs, Extension of Maturity 484 102
Non-Accrual TDRs, Total 1,459 1,529
Accrual TDRs, Deferral of Principal 6
Accrual Tdrs Deferral Of Principal and Interest 177 182
Accrual TDRs, Reduction of Principal and Interest 471 503
Accrual TDRs, Extension of Maturity 369 427
Accrual TDRs 1,017 1,118
Consumer loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 789 811
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 789 811
Accrual TDRs, Deferral of Principal 0 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 104 108
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs $ 104 $ 108