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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | $ 1,943 | $ 168 |  |
Collectively evaluated for impairment | 17,172 | 14,982 |  |
Modified in a troubled debt restructuring | 358 | 4,554 |  |
Total ending allowance balance | 19,473 | 19,704 | $ 19,693 | $ 16,330
Loans: |  |  |  |
Individually evaluated for impairment | 10,953 | 3,292 |  |
Collectively evaluated for impairment | 2,787,919 | 2,460,863 |  |
Total | 2,809,197 | 2,479,348 |  |
Modified in a troubled debt restructuring | 9,802 | 14,626 |  |
Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 523 | 567 |  |
Commercial, industrial, and agricultural |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 645 | 54 |  |
Collectively evaluated for impairment | 7,614 | 7,183 |  |
Modified in a troubled debt restructuring | 28 | 104 |  |
Total ending allowance balance | 8,287 | 7,341 | 6,160 | 5,428
Loans: |  |  |  |
Individually evaluated for impairment | 8,078 | 1,334 |  |
Collectively evaluated for impairment | 1,035,494 | 910,386 |  |
Total | 1,046,665 | 916,297 |  |
Modified in a troubled debt restructuring | 3,093 | 4,577 |  |
Commercial, industrial, and agricultural | Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 0 | 0 |  |
Commercial mortgages |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 1,264 | 4 |  |
Collectively evaluated for impairment | 5,358 | 3,036 |  |
Modified in a troubled debt restructuring | 330 | 4,450 |  |
Total ending allowance balance | 6,952 | 7,490 | 9,007 | 6,753
Loans: |  |  |  |
Individually evaluated for impairment | 2,410 | 1,446 |  |
Collectively evaluated for impairment | 804,360 | 685,714 |  |
Total | 814,002 | 697,776 |  |
Modified in a troubled debt restructuring | 6,709 | 10,049 |  |
Commercial mortgages | Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 523 | 567 |  |
Residential real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 34 | 100 |  |
Collectively evaluated for impairment | 1,465 | 2,056 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 1,499 | 2,156 | 2,033 | 1,653
Loans: |  |  |  |
Individually evaluated for impairment | 465 | 502 |  |
Collectively evaluated for impairment | 813,565 | 770,807 |  |
Total | 814,030 | 771,309 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Residential real estate | Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 0 | 0 |  |
Consumer |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 2,411 | 2,377 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 2,411 | 2,377 | 2,179 | 2,215
Loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 124,785 | 86,035 |  |
Total | 124,785 | 86,035 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Consumer | Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 0 | 0 |  |
Credit cards |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 84 | 103 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 84 | 103 | 120 | 93
Loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 7,569 | 7,623 |  |
Total | 7,569 | 7,623 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Credit cards | Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 0 | 0 |  |
Overdrafts |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 0 | 10 |  |
Collectively evaluated for impairment | 240 | 227 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 240 | 237 | $ 194 | $ 188
Loans: |  |  |  |
Individually evaluated for impairment | 0 | 10 |  |
Collectively evaluated for impairment | 2,146 | 298 |  |
Total | 2,146 | 308 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Overdrafts | Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | $ 0 | $ 0 |  |

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