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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, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | $ 2,222 | $ 1,828
Non-Accrual TDRs, Deferral of Principal and Interest | 4,056 | 4,444
Non-Accrual TDRs, Reduction of Principal and Interest | 421 | 212
Non-Accrual TDRs, Extension of Maturity | 385 | 419
Non-Accrual TDRs, Total | 7,084 | 6,903
Accrual TDRs, Deferral of Principal | 3,786 | 4,817
Accrual Tdrs Deferral Of Principal and Interest | 189 | 198
Accrual TDRs, Reduction of Principal and Interest | 3,078 | 3,768
Accrual TDRs, Extension of Maturity | 1,795 | 2,363
Accrual TDRs | 8,848 | 11,146
Real estate loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | 2,083 | 1,679
Non-Accrual TDRs, Deferral of Principal and Interest | 3,989 | 4,373
Non-Accrual TDRs, Reduction of Principal and Interest | 69 | 143
Non-Accrual TDRs, Extension of Maturity | 0 | 0
Non-Accrual TDRs, Total | 6,141 | 6,195
Accrual TDRs, Deferral of Principal | 3,772 | 4,795
Accrual Tdrs Deferral Of Principal and Interest | 0 | 0
Accrual TDRs, Reduction of Principal and Interest | 1,255 | 1,514
Accrual TDRs, Extension of Maturity | 1,255 | 1,633
Accrual TDRs | 6,282 | 7,942
Commercial and industrial loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | 139 | 149
Non-Accrual TDRs, Deferral of Principal and Interest | 67 | 71
Non-Accrual TDRs, Reduction of Principal and Interest | 352 | 69
Non-Accrual TDRs, Extension of Maturity | 385 | 419
Non-Accrual TDRs, Total | 943 | 708
Accrual TDRs, Deferral of Principal | 14 | 22
Accrual Tdrs Deferral Of Principal and Interest | 189 | 198
Accrual TDRs, Reduction of Principal and Interest | 1,709 | 2,135
Accrual TDRs, Extension of Maturity | 540 | 730
Accrual TDRs | 2,452 | 3,085
Consumer loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Non-Accrual TDRs, Deferral of Principal | 0 | 0
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
Accrual TDRs, Deferral of Principal | 0 | 0
Accrual Tdrs Deferral Of Principal and Interest | 0 | 0
Accrual TDRs, Reduction of Principal and Interest | 114 | 119
Accrual TDRs, Extension of Maturity | 0 | 0
Accrual TDRs | $ 114 | $ 119

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