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Loans and Leases - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | $ 1,473 | $ 2,877
Non-Accrual TDRs, Deferral of Principal and Interest | 1,530 | 3,884
Non-Accrual TDRs, Reduction of Principal and Interest | 843 | 1,237
Non-Accrual TDRs, Extension of Maturity | 430 | 102
Non-Accrual TDRs, Total | 4,276 | 8,100
Accrual TDRs, Deferral of Principal | 3,345 | 3,415
Accrual TDRs, Deferral of Principal and Interest | 166 | 182
Accrual TDRs, Reduction of Principal and Interest | 1,627 | 1,998
Accrual TDRs, Extension of Maturity | 891 | 1,664
Accrual TDRs | 6,029 | 7,259
Real estate loans |  |
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | 462 | 1,935
Non-Accrual TDRs, Deferral of Principal and Interest | 1,423 | 3,761
Non-Accrual TDRs, Reduction of Principal and Interest | 174 | 64
Non-Accrual TDRs, Extension of Maturity | 0 | 0
Non-Accrual TDRs, Total | 2,059 | 5,760
Accrual TDRs, Deferral of Principal | 3,345 | 3,409
Accrual TDRs, Deferral of Principal and Interest | 0 | 0
Accrual TDRs, Reduction of Principal and Interest | 1,148 | 1,387
Accrual TDRs, Extension of Maturity | 741 | 1,237
Accrual TDRs | 5,234 | 6,033
Commercial and industrial loans |  |
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | 265 | 131
Non-Accrual TDRs, Deferral of Principal and Interest | 107 | 123
Non-Accrual TDRs, Reduction of Principal and Interest | 669 | 1,173
Non-Accrual TDRs, Extension of Maturity | 430 | 102
Non-Accrual TDRs, Total | 1,471 | 1,529
Accrual TDRs, Deferral of Principal | 0 | 6
Accrual TDRs, Deferral of Principal and Interest | 166 | 182
Accrual TDRs, Reduction of Principal and Interest | 386 | 503
Accrual TDRs, Extension of Maturity | 150 | 427
Accrual TDRs | 702 | 1,118
Consumer loans |  |
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | 746 | 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 | 746 | 811
Accrual TDRs, Deferral of Principal | 0 | 0
Accrual TDRs, Deferral of Principal and Interest | 0 | 0
Accrual TDRs, Reduction of Principal and Interest | 93 | 108
Accrual TDRs, Extension of Maturity | 0 | 0
Accrual TDRs | $ 93 | $ 108

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