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Loans - Restructured in Troubled Debt (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans at a point in time | loan | 24 |  | 24 |  | 20
Number of loans, period of time | loan | 4 | 4 | 4 | 4 |
Loan Balance | $ 17,744 |  | $ 17,744 |  | $ 17,303
Specific Reserve | 6,471 |  | 6,471 |  | $ 5,689
Pre-Modification Outstanding Recorded Investment | 1,091 | $ 6,551 | 1,091 | $ 6,551 |
Post-Modification Outstanding Recorded Investment | $ 1,091 | $ 6,655 | $ 1,091 | $ 6,655 |
Commercial, Industrial, and Agricultural |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans at a point in time | loan | 11 |  | 11 |  | 11
Number of loans, period of time | loan | 0 | 2 | 0 | 2 |
Loan Balance | $ 4,798 |  | $ 4,798 |  | $ 5,213
Specific Reserve | 237 |  | 237 |  | $ 245
Pre-Modification Outstanding Recorded Investment | 0 | $ 324 | 0 | $ 324 |
Post-Modification Outstanding Recorded Investment | $ 0 | $ 379 | $ 0 | $ 379 |
Commercial mortgages |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans at a point in time | loan | 13 |  | 13 |  | 9
Number of loans, period of time | loan | 4 | 2 | 4 | 2 |
Loan Balance | $ 12,946 |  | $ 12,946 |  | $ 12,090
Specific Reserve | 6,234 |  | 6,234 |  | $ 5,444
Pre-Modification Outstanding Recorded Investment | 1,091 | $ 6,227 | 1,091 | $ 6,227 |
Post-Modification Outstanding Recorded Investment | $ 1,091 | $ 6,276 | $ 1,091 | $ 6,276 |
Residential Real Estate |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans at a point in time | loan | 0 |  | 0 |  | 0
Number of loans, period of time | loan | 0 | 0 | 0 | 0 |
Loan Balance | $ 0 |  | $ 0 |  | $ 0
Specific Reserve | 0 |  | 0 |  | $ 0
Pre-Modification Outstanding Recorded Investment | 0 | $ 0 | 0 | $ 0 |
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0 |
Consumer |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans at a point in time | loan | 0 |  | 0 |  | 0
Number of loans, period of time | loan | 0 | 0 | 0 | 0 |
Loan Balance | $ 0 |  | $ 0 |  | $ 0
Specific Reserve | 0 |  | 0 |  | $ 0
Pre-Modification Outstanding Recorded Investment | 0 | $ 0 | 0 | $ 0 |
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0 |
Credit Cards |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of loans at a point in time | loan | 0 |  | 0 |  | 0
Number of loans, period of time | loan | 0 | 0 | 0 | 0 |
Loan Balance | $ 0 |  | $ 0 |  | $ 0
Specific Reserve | 0 |  | 0 |  | $ 0
Pre-Modification Outstanding Recorded Investment | 0 | $ 0 | 0 | $ 0 |
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 0 | $ 0 |

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