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Loans - Allowance for Credit/Loan Losses and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment |  |  | $ 1,943 |  |
Collectively evaluated for impairment |  |  | 17,172 |  |
Modified in a troubled debt restructuring |  |  | 358 |  |
Total ending allowance balance | $ 34,340 | $ 19,473 | 19,473 | $ 19,704 | $ 19,693
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 10,953 |  |
Collectively evaluated for impairment |  |  | 2,787,919 |  |
Modified in a troubled debt restructuring |  |  | 9,802 |  |
Total ending loans balance | 3,371,789 |  | 2,809,197 |  |
Acquired with deteriorated credit quality |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Total ending allowance balance |  |  | 0 |  |
Loans: |  |  |  |  |
Total ending loans balance |  |  | 523 |  |
Commercial, industrial, and agricultural |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 645 |  |
Collectively evaluated for impairment |  |  | 7,614 |  |
Modified in a troubled debt restructuring |  |  | 28 |  |
Total ending allowance balance |  | 8,287 | 8,287 | 7,341 | 6,160
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 8,078 |  |
Collectively evaluated for impairment |  |  | 1,035,494 |  |
Modified in a troubled debt restructuring |  |  | 3,093 |  |
Total ending loans balance |  |  | 1,046,665 |  |
Commercial, industrial, and agricultural | Acquired with deteriorated credit quality |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Total ending allowance balance |  |  | 0 |  |
Loans: |  |  |  |  |
Total ending loans balance |  |  | 0 |  |
Commercial mortgages |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 1,264 |  |
Collectively evaluated for impairment |  |  | 5,358 |  |
Modified in a troubled debt restructuring |  |  | 330 |  |
Total ending allowance balance |  | 6,952 | 6,952 | 7,490 | 9,007
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 2,410 |  |
Collectively evaluated for impairment |  |  | 804,360 |  |
Modified in a troubled debt restructuring |  |  | 6,709 |  |
Total ending loans balance |  |  | 814,002 |  |
Commercial mortgages | Acquired with deteriorated credit quality |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Total ending allowance balance |  |  | 0 |  |
Loans: |  |  |  |  |
Total ending loans balance |  |  | 523 |  |
Residential Real Estate |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 34 |  |
Collectively evaluated for impairment |  |  | 1,465 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending allowance balance |  | 1,499 | 1,499 | 2,156 | 2,033
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 465 |  |
Collectively evaluated for impairment |  |  | 813,565 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending loans balance |  |  | 814,030 |  |
Residential Real Estate | Acquired with deteriorated credit quality |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Total ending allowance balance |  |  | 0 |  |
Loans: |  |  |  |  |
Total ending loans balance |  |  | 0 |  |
Consumer |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 0 |  |
Collectively evaluated for impairment |  |  | 2,411 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending allowance balance |  | 2,411 | 2,411 | 2,377 | 2,179
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 0 |  |
Collectively evaluated for impairment |  |  | 124,785 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending loans balance |  |  | 124,785 |  |
Consumer | Acquired with deteriorated credit quality |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Total ending allowance balance |  |  | 0 |  |
Loans: |  |  |  |  |
Total ending loans balance |  |  | 0 |  |
Credit Cards |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 0 |  |
Collectively evaluated for impairment |  |  | 84 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending allowance balance | 66 | 84 | 84 | 103 | 120
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 0 |  |
Collectively evaluated for impairment |  |  | 7,569 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending loans balance | 8,115 |  | 7,569 |  |
Credit Cards | Acquired with deteriorated credit quality |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Total ending allowance balance |  |  | 0 |  |
Loans: |  |  |  |  |
Total ending loans balance |  |  | 0 |  |
Overdrafts |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 0 |  |
Collectively evaluated for impairment |  |  | 240 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending allowance balance | 244 | $ 240 | 240 | $ 237 | $ 194
Loans: |  |  |  |  |
Individually evaluated for impairment |  |  | 0 |  |
Collectively evaluated for impairment |  |  | 2,146 |  |
Modified in a troubled debt restructuring |  |  | 0 |  |
Total ending loans balance | $ 336 |  | 2,146 |  |
Overdrafts | Acquired with deteriorated credit quality |  |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |  |
Total ending allowance balance |  |  | 0 |  |
Loans: |  |  |  |  |
Total ending loans balance |  |  | $ 0 |  |

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