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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | $ 168 | $ 47 |  |
Collectively evaluated for impairment | 14,982 | 13,957 |  |
Modified in a troubled debt restructuring | 4,554 | 5,689 |  |
Total ending allowance balance | 19,704 | 19,693 | $ 16,330 | $ 16,737
Loans: |  |  |  |
Individually evaluated for impairment | 3,292 | 1,238 |  |
Collectively evaluated for impairment | 2,460,863 | 2,130,228 |  |
Total | 2,479,348 | 2,149,848 |  |
Modified in a troubled debt restructuring | 14,626 | 17,303 |  |
Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 567 | 1,079 |  |
Commercial, industrial, and agricultural |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 54 | 47 |  |
Collectively evaluated for impairment | 7,183 | 5,868 |  |
Modified in a troubled debt restructuring | 104 | 245 |  |
Total ending allowance balance | 7,341 | 6,160 | 5,428 | 6,035
Loans: |  |  |  |
Individually evaluated for impairment | 1,334 | 1,187 |  |
Collectively evaluated for impairment | 910,386 | 698,206 |  |
Total | 916,297 | 704,606 |  |
Modified in a troubled debt restructuring | 4,577 | 5,213 |  |
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 | 4 | 0 |  |
Collectively evaluated for impairment | 3,036 | 3,563 |  |
Modified in a troubled debt restructuring | 4,450 | 5,444 |  |
Total ending allowance balance | 7,490 | 9,007 | 6,753 | 5,605
Loans: |  |  |  |
Individually evaluated for impairment | 1,446 | 51 |  |
Collectively evaluated for impairment | 685,714 | 631,377 |  |
Total | 697,776 | 644,597 |  |
Modified in a troubled debt restructuring | 10,049 | 12,090 |  |
Commercial mortgages | Acquired with deteriorated credit quality |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Total ending allowance balance | 0 | 0 |  |
Loans: |  |  |  |
Total | 567 | 1,079 |  |
Residential real estate |  |  |  |
Ending allowance balance attributable to loans: |  |  |  |
Individually evaluated for impairment | 100 | 0 |  |
Collectively evaluated for impairment | 2,056 | 2,033 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 2,156 | 2,033 | 1,653 | 2,475
Loans: |  |  |  |
Individually evaluated for impairment | 502 | 0 |  |
Collectively evaluated for impairment | 770,807 | 713,347 |  |
Total | 771,309 | 713,347 |  |
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 | 2,377 | 2,179 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 2,377 | 2,179 | 2,215 | 2,371
Loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 86,035 | 80,193 |  |
Total | 86,035 | 80,193 |  |
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 | 103 | 120 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 103 | 120 | 93 | 90
Loans: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 7,623 | 6,753 |  |
Total | 7,623 | 6,753 |  |
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 | 10 | 0 |  |
Collectively evaluated for impairment | 227 | 194 |  |
Modified in a troubled debt restructuring | 0 | 0 |  |
Total ending allowance balance | 237 | 194 | $ 188 | $ 161
Loans: |  |  |  |
Individually evaluated for impairment | 10 | 0 |  |
Collectively evaluated for impairment | 298 | 352 |  |
Total | 308 | 352 |  |
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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- Definition Allowance for loan losses ending allowance balance attributable to loans. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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