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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

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