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Loans, Allowance for Credit Losses, and Asset Quality Information (Schedule of Activity in Allowance for Loan Losses for Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 65,022 | $ 42,342 | $ 52,388 | $ 21,398 | $ 21,398
Charge-offs | (1,105) | (668) | (5,553) | (6,441) | (8,502)
Recoveries | 1,111 | 1,432 | 3,618 | 3,261 | 4,453
Provisions/(Reversals) | (1,400) | 6,120 | (1,400) | 31,008 | 35,039
Ending balance | 63,628 | 49,226 | 63,628 | 49,226 | 52,388
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 4,314 |  | 4,314 | 6,551
Collectively evaluated for impairment |  | 44,751 |  | 44,751 | 45,699
Purchased credit impaired |  | 161 |  | 161 | 138
Loans receivable: |  |  |  |  |
Loans, gross | 4,873,230 | 4,819,175 | 4,873,230 | 4,819,175 | 4,735,013
Unamortized net deferred loan fees | (3,389) | (5,439) | (3,389) | (5,439) | (3,698)
Total loans | 4,869,841 | 4,813,736 | 4,869,841 | 4,813,736 | 4,731,315
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 34,179 |  | 34,179 | 36,281
Collectively evaluated for impairment |  | 4,775,380 |  | 4,775,380 | 4,690,141
Purchased credit impaired |  | 9,616 |  | 9,616 | 8,591
Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 14,575 |  |
Ending balance |  |  |  |  | 14,575
Commercial, financial, and agricultural |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 14,809 | 5,989 | 11,316 | 4,553 | 4,553
Charge-offs | (899) | (325) | (2,887) | (4,256) | (5,608)
Recoveries | 398 | 126 | 1,065 | 603 | 745
Provisions/(Reversals) | (808) | 2,986 | 939 | 7,876 | 11,626
Ending balance | 13,500 | 8,776 | 13,500 | 8,776 | 11,316
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 1,814 |  | 1,814 | 3,546
Collectively evaluated for impairment |  | 6,921 |  | 6,921 | 7,742
Purchased credit impaired |  | 41 |  | 41 | 28
Loans receivable: |  |  |  |  |
Loans, gross | 612,554 | 804,831 | 612,554 | 804,831 | 782,549
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 7,001 |  | 7,001 | 7,700
Collectively evaluated for impairment |  | 797,654 |  | 797,654 | 774,712
Purchased credit impaired |  | 176 |  | 176 | 137
Commercial, financial, and agricultural | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 3,067 |  |
Ending balance |  |  |  |  | 3,067
Real estate, commercial | Real estate – construction, land development & other land loans |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 10,104 | 5,677 | 5,355 | 1,976 | 1,976
Charge-offs | 0 | (6) | (66) | (51) | (51)
Recoveries | 98 | 213 | 784 | 856 | 1,552
Provisions/(Reversals) | 2,187 | 388 | 176 | 3,491 | 1,878
Ending balance | 12,389 | 6,272 | 12,389 | 6,272 | 5,355
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 56 |  | 56 | 30
Collectively evaluated for impairment |  | 6,216 |  | 6,216 | 5,325
Purchased credit impaired |  | 0 |  | 0 | 0
Loans receivable: |  |  |  |  |
Loans, gross | 588,103 | 653,120 | 588,103 | 653,120 | 570,672
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 853 |  | 853 | 677
Collectively evaluated for impairment |  | 652,117 |  | 652,117 | 569,845
Purchased credit impaired |  | 150 |  | 150 | 150
Real estate, commercial | Real estate – construction, land development & other land loans | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 6,140 |  |
Ending balance |  |  |  |  | 6,140
Real estate, commercial | Real estate – mortgage – commercial and other |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 25,358 | 18,755 | 23,603 | 8,938 | 8,938
Charge-offs | (4) | 0 | (1,838) | (545) | (968)
Recoveries | 79 | 482 | 419 | 584 | 621
Provisions/(Reversals) | (1,336) | 2,369 | 2,170 | 12,629 | 15,012
Ending balance | 24,097 | 21,606 | 24,097 | 21,606 | 23,603
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 1,624 |  | 1,624 | 2,175
Collectively evaluated for impairment |  | 19,982 |  | 19,982 | 21,428
Purchased credit impaired |  | 0 |  | 0 | 0
Loans receivable: |  |  |  |  |
Loans, gross | 2,423,341 | 1,983,622 | 2,423,341 | 1,983,622 | 2,049,203
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 16,349 |  | 16,349 | 18,582
Collectively evaluated for impairment |  | 1,963,303 |  | 1,963,303 | 2,026,682
Purchased credit impaired |  | 3,970 |  | 3,970 | 3,939
Real estate, commercial | Real estate – mortgage – commercial and other | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | (257) |  |
Ending balance |  |  |  |  | (257)
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 8,651 | 8,339 | 8,048 | 3,832 | 3,832
Charge-offs | (24) | (4) | (138) | (478) | (478)
Recoveries | 176 | 279 | 499 | 594 | 754
Provisions/(Reversals) | (1,032) | 82 | (3,222) | 4,748 | 3,940
Ending balance | 7,771 | 8,696 | 7,771 | 8,696 | 8,048
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 820 |  | 820 | 800
Collectively evaluated for impairment |  | 7,760 |  | 7,760 | 7,141
Purchased credit impaired |  | 116 |  | 116 | 107
Loans receivable: |  |  |  |  |
Loans, gross | 914,266 | 1,017,087 | 914,266 | 1,017,087 | 972,378
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 9,657 |  | 9,657 | 9,303
Collectively evaluated for impairment |  | 1,002,254 |  | 1,002,254 | 958,848
Purchased credit impaired |  | 5,176 |  | 5,176 | 4,227
Real estate, mortgage | Real estate – mortgage – residential (1-4 family) first mortgages | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,584 |  |
Ending balance |  |  |  |  | 2,584
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 3,737 | 2,359 | 2,375 | 1,127 | 1,127
Charge-offs | 0 | (23) | (139) | (404) | (524)
Recoveries | 311 | 207 | 540 | 373 | 487
Provisions/(Reversals) | (546) | (83) | (1,854) | 1,364 | 1,285
Ending balance | 3,502 | 2,460 | 3,502 | 2,460 | 2,375
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 0 |  | 0 | 0
Collectively evaluated for impairment |  | 2,460 |  | 2,460 | 2,375
Purchased credit impaired |  | 0 |  | 0 | 0
Loans receivable: |  |  |  |  |
Loans, gross | 281,219 | 310,326 | 281,219 | 310,326 | 306,256
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 319 |  | 319 | 15
Collectively evaluated for impairment |  | 309,911 |  | 309,911 | 306,141
Purchased credit impaired |  | 96 |  | 96 | 100
Real estate, mortgage | Real estate – mortgage – home equity loans / lines of credit | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,580 |  |
Ending balance |  |  |  |  | 2,580
Consumer loans |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 2,363 | 1,223 | 1,478 | 972 | 972
Charge-offs | (178) | (310) | (485) | (707) | (873)
Recoveries | 49 | 125 | 311 | 251 | 294
Provisions/(Reversals) | 135 | 308 | 391 | 830 | 1,085
Ending balance | 2,369 | 1,346 | 2,369 | 1,346 | 1,478
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 0 |  | 0 | 0
Collectively evaluated for impairment |  | 1,342 |  | 1,342 | 1,475
Purchased credit impaired |  | 4 |  | 4 | 3
Loans receivable: |  |  |  |  |
Loans, gross | 53,747 | 50,189 | 53,747 | 50,189 | 53,955
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 0 |  | 0 | 4
Collectively evaluated for impairment |  | 50,141 |  | 50,141 | 53,913
Purchased credit impaired |  | 48 |  | 48 | 38
Consumer loans | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 674 |  |
Ending balance |  |  |  |  | 674
Unallocated |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 0 | 213 | 0 | 0
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 | 0
Provisions/(Reversals) | 0 | 70 | 0 | 70 | 213
Ending balance | $ 0 | 70 | 0 | 70 | 213
Ending balances: Allowance for loan losses |  |  |  |  |
Individually evaluated for impairment |  | 0 |  | 0 | 0
Collectively evaluated for impairment |  | 70 |  | 70 | 213
Purchased credit impaired |  | 0 |  | 0 | 0
Loans receivable: |  |  |  |  |
Loans, gross |  | 0 |  | 0 | 0
Ending balances: Loans |  |  |  |  |
Individually evaluated for impairment |  | 0 |  | 0 | 0
Collectively evaluated for impairment |  | 0 |  | 0 | 0
Purchased credit impaired |  | $ 0 |  | $ 0 | 0
Unallocated | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ (213) |  |
Ending balance |  |  |  |  | $ (213)

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