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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

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