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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | $ 2,877 | $ 1,828 | $ 3,131
Non-Accrual TDRs, Deferral of Principal and Interest | 3,884 | 4,444 | 1,329
Non-Accrual TDRs, Reduction of Principal and Interest | 1,237 | 212 | 1,329
Non-Accrual TDRs, Extension of Maturity | 102 | 419 | 1,089
Non-Accrual TDRs, Total | 8,100 | 6,903 | 6,878
Accrual TDRs, Deferral of Principal | 3,415 | 4,817 | 4,241
Accrual TDRs, Deferral of Principal and Interest | 182 | 198 | 214
Accrual TDRs, Reduction of Principal and Interest | 1,998 | 3,768 | 3,222
Accrual TDRs, Extension of Maturity | 1,664 | 2,363 | 2,622
Accrual TDRs | 7,259 | 11,146 | 10,299
Real estate loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | 1,935 | 1,679 | 2,864
Non-Accrual TDRs, Deferral of Principal and Interest | 3,761 | 4,373 | 1,329
Non-Accrual TDRs, Reduction of Principal and Interest | 64 | 143 | 216
Non-Accrual TDRs, Extension of Maturity | 0 | 0 | 352
Non-Accrual TDRs, Total | 5,760 | 6,195 | 4,761
Accrual TDRs, Deferral of Principal | 3,409 | 4,795 | 3,951
Accrual TDRs, Deferral of Principal and Interest | 0 | 0 | 0
Accrual TDRs, Reduction of Principal and Interest | 1,387 | 1,514 | 1,549
Accrual TDRs, Extension of Maturity | 1,237 | 1,633 | 1,677
Accrual TDRs | 6,033 | 7,942 | 7,177
Real estate loans [Member] | Retail [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | 0 | 0 | 0
Non-Accrual TDRs, Deferral of Principal and Interest | 0 | 0 | 0
Non-Accrual TDRs, Reduction of Principal and Interest | 0 | 0 | 0
Non-Accrual TDRs, Extension of Maturity | 0 | 0 | 344
Non-Accrual TDRs, Total | 0 | 0 | 344
Accrual TDRs, Deferral of Principal | 0 | 0 | 0
Accrual TDRs, Deferral of Principal and Interest | 0 | 0 | 0
Accrual TDRs, Reduction of Principal and Interest | 1,188 | 1,228 | 1,227
Accrual TDRs, Extension of Maturity | 0 |  | 0
Accrual TDRs | 1,188 | 1,228 | 1,227
Real estate loans [Member] | Hotel/motel [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | 1,156 | 1,292 | 1,216
Non-Accrual TDRs, Deferral of Principal and Interest | 3,495 | 3,722 | 28
Non-Accrual TDRs, Reduction of Principal and Interest | 0 | 0 | 0
Non-Accrual TDRs, Extension of Maturity | 0 | 0 | 0
Non-Accrual TDRs, Total | 4,651 | 5,014 | 1,244
Accrual TDRs, Deferral of Principal | 0 | 0 | 414
Accrual TDRs, Deferral of Principal and Interest | 0 | 0 | 0
Accrual TDRs, Reduction of Principal and Interest | 169 | 0 | 0
Accrual TDRs, Extension of Maturity | 0 |  | 0
Accrual TDRs | 169 | 0 | 414
Real estate loans [Member] | Other [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | 779 | 387 | 959
Non-Accrual TDRs, Deferral of Principal and Interest | 266 | 651 | 1,301
Non-Accrual TDRs, Reduction of Principal and Interest | 64 | 143 | 216
Non-Accrual TDRs, Extension of Maturity | 0 | 0 | 8
Non-Accrual TDRs, Total | 1,109 | 1,181 | 2,484
Accrual TDRs, Deferral of Principal | 2,777 | 4,012 | 3,537
Accrual TDRs, Deferral of Principal and Interest | 0 |  | 0
Accrual TDRs, Reduction of Principal and Interest | 30 | 286 | 322
Accrual TDRs, Extension of Maturity | 959 | 1,344 | 1,378
Accrual TDRs | 3,766 | 5,642 | 5,237
Real estate loans [Member] | Residential property [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | 0 | 0 | 689
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 | 0 | 0 | 689
Accrual TDRs, Deferral of Principal | 632 | 783 | 0
Accrual TDRs, Deferral of Principal and Interest | 0 |  | 0
Accrual TDRs, Reduction of Principal and Interest | 0 | 0 | 0
Accrual TDRs, Extension of Maturity | 278 | 289 | 299
Accrual TDRs | 910 | 1,072 | 299
Commercial and industrial loans [Member] | Commercial term [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | 131 | 149 | 45
Non-Accrual TDRs, Deferral of Principal and Interest | 123 | 71 | 0
Non-Accrual TDRs, Reduction of Principal and Interest | 1,173 | 69 | 997
Non-Accrual TDRs, Extension of Maturity | 102 | 419 | 679
Non-Accrual TDRs, Total | 1,529 | 708 | 1,721
Accrual TDRs, Deferral of Principal | 6 | 22 | 40
Accrual TDRs, Deferral of Principal and Interest | 182 | 198 | 214
Accrual TDRs, Reduction of Principal and Interest | 503 | 2,135 | 1,673
Accrual TDRs, Extension of Maturity | 427 | 662 | 945
Accrual TDRs | 1,118 | 3,017 | 2,872
Commercial and industrial loans [Member] | Commercial lines of credit [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal |  | 0 | 222
Non-Accrual TDRs, Deferral of Principal and Interest |  |  | 0
Non-Accrual TDRs, Reduction of Principal and Interest |  | 0 | 0
Non-Accrual TDRs, Extension of Maturity |  | 0 | 58
Non-Accrual TDRs, Total |  | 0 | 280
Accrual TDRs, Deferral of Principal |  | 0 | 0
Accrual TDRs, Deferral of Principal and Interest |  |  | 0
Accrual TDRs, Reduction of Principal and Interest |  |  | 0
Accrual TDRs, Extension of Maturity |  | 68 | 0
Accrual TDRs |  | 68 | 0
Consumer loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Non-Accrual TDRs, Deferral of Principal | 811 |  | 0
Non-Accrual TDRs, Deferral of Principal and Interest | 0 |  | 0
Non-Accrual TDRs, Reduction of Principal and Interest | 0 | 0 | 116
Non-Accrual TDRs, Extension of Maturity | 0 |  | 0
Non-Accrual TDRs, Total | 811 | 0 | 116
Accrual TDRs, Deferral of Principal | 0 | 0 | 250
Accrual TDRs, Deferral of Principal and Interest | 0 |  | 0
Accrual TDRs, Reduction of Principal and Interest | 108 | 119 | 0
Accrual TDRs, Extension of Maturity | 0 |  | 0
Accrual TDRs | $ 108 | $ 119 | $ 250

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