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Loans and Asset Quality Information - Schedule of Activity in Allowance for Loan Losses for Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | $ 21,398 | $ 21,039 | $ 23,298
Charge-offs | (8,502) | (6,303) | (6,971)
Recoveries | 4,453 | 4,399 | 8,301
Provisions | 35,039 | 2,263 | (3,589)
Ending balance | 52,388 | 21,398 | 21,039
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 6,551 | 3,574 | 2,269
Collectively evaluated for impairment | 45,699 | 17,641 | 18,642
Purchased credit impaired | 138 | 183 | 128
Loans receivable: |  |  |
Loans | 4,735,013 | 4,451,525 | 4,247,765
Unamortized net deferred loan costs | (3,698) | 1,941 | 1,299
Total loans | 4,731,315 | 4,453,466 | 4,249,064
Ending balances: Loans |  |  |
Individually evaluated for impairment | 36,281 | 25,202 | 24,253
Collectively evaluated for impairment | 4,690,141 | 4,413,659 | 4,206,119
Purchased credit impaired | 8,591 | 12,664 | 17,393
Commercial, financial, and agricultural |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 4,553 | 2,889 | 3,111
Charge-offs | (5,608) | (2,473) | (2,128)
Recoveries | 745 | 980 | 1,195
Provisions | 11,626 | 3,157 | 711
Ending balance | 11,316 | 4,553 | 2,889
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 3,546 | 1,791 | 226
Collectively evaluated for impairment | 7,742 | 2,720 | 2,661
Purchased credit impaired | 28 | 42 | 2
Loans receivable: |  |  |
Loans | 782,549 | 504,271 | 457,037
Ending balances: Loans |  |  |
Individually evaluated for impairment | 7,700 | 4,957 | 696
Collectively evaluated for impairment | 774,712 | 499,101 | 456,111
Purchased credit impaired | 137 | 213 | 230
Installment loans to individuals |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 972 | 952 | 950
Charge-offs | (873) | (757) | (781)
Recoveries | 294 | 235 | 309
Provisions | 1,085 | 542 | 474
Ending balance | 1,478 | 972 | 952
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 1,475 | 961 | 941
Purchased credit impaired | 3 | 11 | 11
Loans receivable: |  |  |
Loans | 53,955 | 56,172 | 71,392
Ending balances: Loans |  |  |
Individually evaluated for impairment | 4 | 0 | 0
Collectively evaluated for impairment | 53,913 | 56,083 | 71,140
Purchased credit impaired | 38 | 89 | 252
Unallocated |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 0 | 110 | 1,972
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Provisions | 213 | (110) | (1,862)
Ending balance | 213 | 0 | 110
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 0 | 0 | 0
Collectively evaluated for impairment | 213 | 0 | 110
Purchased credit impaired | 0 | 0 | 0
Loans receivable: |  |  |
Loans | 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
Real estate – construction, land development & other land loans | Real estate, commercial |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 1,976 | 2,243 | 2,816
Charge-offs | (51) | (553) | (158)
Recoveries | 1,552 | 1,275 | 4,097
Provisions | 1,878 | (989) | (4,512)
Ending balance | 5,355 | 1,976 | 2,243
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 30 | 50 | 134
Collectively evaluated for impairment | 5,325 | 1,926 | 2,109
Purchased credit impaired | 0 | 0 | 0
Loans receivable: |  |  |
Loans | 570,672 | 530,866 | 518,976
Ending balances: Loans |  |  |
Individually evaluated for impairment | 677 | 796 | 1,345
Collectively evaluated for impairment | 569,845 | 529,904 | 517,453
Purchased credit impaired | 150 | 166 | 178
Real estate – mortgage – residential (1-4 family) first mortgages | Real estate, mortgage |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 3,832 | 5,197 | 6,147
Charge-offs | (478) | (657) | (1,734)
Recoveries | 754 | 705 | 833
Provisions | 3,940 | (1,413) | (49)
Ending balance | 8,048 | 3,832 | 5,197
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 800 | 750 | 955
Collectively evaluated for impairment | 7,141 | 2,976 | 4,143
Purchased credit impaired | 107 | 106 | 99
Loans receivable: |  |  |
Loans | 972,378 | 1,105,014 | 1,054,176
Ending balances: Loans |  |  |
Individually evaluated for impairment | 9,303 | 9,546 | 12,391
Collectively evaluated for impairment | 958,848 | 1,090,125 | 1,035,532
Purchased credit impaired | 4,227 | 5,343 | 6,253
Real estate – mortgage – home equity loans / lines of credit | Real estate, mortgage |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 1,127 | 1,665 | 1,827
Charge-offs | (524) | (307) | (711)
Recoveries | 487 | 629 | 364
Provisions | 1,285 | (860) | 185
Ending balance | 2,375 | 1,127 | 1,665
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 0 | 0 | 48
Collectively evaluated for impairment | 2,375 | 1,127 | 1,608
Purchased credit impaired | 0 | 0 | 9
Loans receivable: |  |  |
Loans | 306,256 | 337,922 | 359,162
Ending balances: Loans |  |  |
Individually evaluated for impairment | 15 | 333 | 296
Collectively evaluated for impairment | 306,141 | 337,366 | 358,522
Purchased credit impaired | 100 | 223 | 344
Real estate – mortgage – commercial and other | Real estate, commercial |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance | 8,938 | 7,983 | 6,475
Charge-offs | (968) | (1,556) | (1,459)
Recoveries | 621 | 575 | 1,503
Provisions | 15,012 | 1,936 | 1,464
Ending balance | 23,603 | 8,938 | 7,983
Ending balances: Allowance for loan losses |  |  |
Individually evaluated for impairment | 2,175 | 983 | 906
Collectively evaluated for impairment | 21,428 | 7,931 | 7,070
Purchased credit impaired | 0 | 24 | 7
Loans receivable: |  |  |
Loans | 2,049,203 | 1,917,280 | 1,787,022
Ending balances: Loans |  |  |
Individually evaluated for impairment | 18,582 | 9,570 | 9,525
Collectively evaluated for impairment | 2,026,682 | 1,901,080 | 1,767,361
Purchased credit impaired | $ 3,939 | $ 6,630 | $ 10,136

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