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Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 49,026 |  |  |  | $ 46,211 | $ 49,026 | $ 46,211 | $ 42,737 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (13,478) | (6,428) | (7,008) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 9,564 | 2,433 | 2,932 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (3,914) | (3,995) | (4,076) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 7,550 |  |  |
Provision for loan losses | $ 2,950 | $ 1,700 | $ 900 | 1,500 | $ 1,000 | $ 2,250 | $ 1,810 | 1,750 | 7,050 | 6,810 | 7,550 |  |  |
Ending balance | 52,162 |  |  |  | 49,026 |  |  |  | 52,162 | 49,026 | 46,211 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | $ 2,012 | $ 1,514 | $ 2,674
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 48,179 | 44,960 | 41,760
Purchased with deteriorated credit quality | 52,162 |  |  | 49,026 | 49,026 |  |  | 46,211 | 52,162 | 46,211 | 46,211 | 52,162 | 49,026 | 46,211
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,552 |  |  |  | 1,777 | 2,552 | 1,777 |  |  |  |
Ending balance | 1,971 |  |  |  | 2,552 |  |  |  | 1,971 | 2,552 | 1,777 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 1,971 |  |  | 2,552 | 2,552 |  |  | 1,777 | 2,552 | 1,777 | 1,777 | 1,971 | 2,552 | 1,777
Commercial, financial, agricultural |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 8,269 |  |  |  | 5,542 | 8,269 | 5,542 | 5,486 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (2,681) | (2,415) | (2,874) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 1,428 | 618 | 422 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (1,253) | (1,797) | (2,452) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 2,508 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 3,642 | 4,524 |  |  |  |
Ending balance | 10,658 |  |  |  | 8,269 |  |  |  | 10,658 | 8,269 | 5,542 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,434 | 336 | 190
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 8,932 | 7,772 | 5,040
Purchased with deteriorated credit quality | 10,658 |  |  | 8,269 | 8,269 |  |  | 5,542 | 8,269 | 5,542 | 5,542 | 10,658 | 8,269 | 5,542
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 161 |  |  |  | 312 | 161 | 312 |  |  |  |
Ending balance | 292 |  |  |  | 161 |  |  |  | 292 | 161 | 312 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 292 |  |  | 161 | 161 |  |  | 312 | 161 | 312 | 312 | 292 | 161 | 312
Real estate – construction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 4,755 |  |  |  | 3,428 | 4,755 | 3,428 | 2,380 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 | (51) | 0 |  |  |
Recoveries |  |  |  |  |  |  |  |  | 21 | 13 | 105 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | 21 | (38) | 105 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 943 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 253 | 1,365 |  |  |  |
Ending balance | 5,029 |  |  |  | 4,755 |  |  |  | 5,029 | 4,755 | 3,428 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 16 | 68 | 4
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 5,013 | 4,687 | 3,424
Purchased with deteriorated credit quality | 5,029 |  |  | 4,755 | 4,755 |  |  | 3,428 | 4,755 | 3,428 | 3,428 | 5,029 | 4,755 | 3,428
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |  |  |
Ending balance | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 0 |  |  | 0 | 0 |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 0
Real estate – 1-4 family mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 10,139 |  |  |  | 12,009 | 10,139 | 12,009 | 14,294 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (1,602) | (2,023) | (1,713) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 712 | 573 | 733 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (890) | (1,450) | (980) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | (1,305) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 565 | (420) |  |  |  |
Ending balance | 9,814 |  |  |  | 10,139 |  |  |  | 9,814 | 10,139 | 12,009 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 160 | 79 | 606
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 9,363 | 9,572 | 10,831
Purchased with deteriorated credit quality | 9,814 |  |  | 10,139 | 10,139 |  |  | 12,009 | 9,814 | 12,009 | 14,294 | 9,814 | 10,139 | 12,009
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 488 |  |  |  | 572 | 488 | 572 |  |  |  |
Ending balance | 291 |  |  |  | 488 |  |  |  | 291 | 488 | 572 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 291 |  |  | 488 | 488 |  |  | 572 | 488 | 572 | 572 | 291 | 488 | 572
Real estate – commercial mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 24,492 |  |  |  | 23,384 | 24,492 | 23,384 | 19,059 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (1,490) | (1,197) | (1,791) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 689 | 1,108 | 1,565 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (801) | (89) | (226) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 4,551 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 1,299 | 1,197 |  |  |  |
Ending balance | 24,990 |  |  |  | 24,492 |  |  |  | 24,990 | 24,492 | 23,384 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 396 | 1,027 | 1,867
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 23,208 | 21,564 | 20,625
Purchased with deteriorated credit quality | 24,990 |  |  | 24,492 | 24,492 |  |  | 23,384 | 24,492 | 23,384 | 23,384 | 24,990 | 24,492 | 23,384
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,901 |  |  |  | 892 | 1,901 | 892 |  |  |  |
Ending balance | 1,386 |  |  |  | 1,901 |  |  |  | 1,386 | 1,901 | 892 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | 1,386 |  |  | 1,901 | 1,901 |  |  | 892 | 1,901 | 892 | 892 | 1,386 | 1,901 | 892
Installment and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,371 |  |  |  | 1,848 | 1,371 | 1,848 | 1,518 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (7,705) | (742) | (630) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 6,714 | 121 | 107 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (991) | (621) | (523) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  | 853 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  | 1,291 | 144 |  |  |  |
Ending balance | 1,671 |  |  |  | 1,371 |  |  |  | 1,671 | 1,371 | 1,848 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 6 | 4 | 7
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,663 | 1,365 | 1,840
Purchased with deteriorated credit quality | 1,671 |  |  | 1,371 | 1,371 |  |  | 1,848 | 1,371 | 1,848 | 1,848 | 1,671 | 1,371 | 1,848
Installment and Other | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2 |  |  |  | 1 | 2 | 1 |  |  |  |
Ending balance | 2 |  |  |  | 2 |  |  |  | 2 | 2 | 1 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased with deteriorated credit quality | $ 2 |  |  | $ 2 | $ 2 |  |  | $ 1 | $ 2 | $ 1 | $ 1 | $ 2 | $ 2 | $ 1

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