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Loans - Restructured in Troubled Debt (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 loan | Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 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 | 0 | 4 | 0 |
Loan Balance | $ 18,002 |  | $ 18,002 |  | $ 17,303
Specific Reserve | 6,523 |  | 6,523 |  | $ 5,689
Pre-Modification Outstanding Recorded Investment | 1,091 |  | 1,091 |  |
Post-Modification Outstanding Recorded Investment | $ 1,091 |  | $ 1,091 |  |
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 |  | 0 |  |
Loan Balance | $ 4,872 |  | $ 4,872 |  | $ 5,213
Specific Reserve | 257 |  | 257 |  | $ 245
Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |  |
Post-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |  |
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 |  | 4 |  |
Loan Balance | $ 13,130 |  | $ 13,130 |  | $ 12,090
Specific Reserve | 6,266 |  | 6,266 |  | $ 5,444
Pre-Modification Outstanding Recorded Investment | 1,091 |  | 1,091 |  |
Post-Modification Outstanding Recorded Investment | $ 1,091 |  | $ 1,091 |  |
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 |  |
Loan Balance | $ 0 |  | $ 0 |  | $ 0
Specific Reserve | 0 |  | 0 |  | $ 0
Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |  |
Post-Modification Outstanding Recorded Investment | $ 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 |  |
Loan Balance | $ 0 |  | $ 0 |  | $ 0
Specific Reserve | 0 |  | 0 |  | $ 0
Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |  |
Post-Modification Outstanding Recorded Investment | $ 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 |  |
Loan Balance | $ 0 |  | $ 0 |  | $ 0
Specific Reserve | 0 |  | 0 |  | $ 0
Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |  |
Post-Modification Outstanding Recorded Investment | $ 0 |  | $ 0 |  |

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