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Allowance for Credit Losses - Roll Forward Of the Allowance for Loan Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Allowance for loan losses: |  |  |  |  |  |
Beginning balance | $ 173,106,000 | $ 120,185,000 | $ 176,144,000 | $ 52,162,000 |  |
Accounting standards update [Extensible List] |  |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |
Charge-offs | (2,854,000) | (3,566,000) | (8,224,000) | (8,915,000) |  |
Recoveries | 2,102,000 | 1,868,000 | 4,434,000 | 6,406,000 |  |
Net (charge-offs) recoveries | (752,000) | (1,698,000) | (3,790,000) | (2,509,000) |  |
Provision for credit losses on loans | 0 | 26,900,000 | 0 | 53,250,000 |  |
Ending balance | 172,354,000 | 145,387,000 | 172,354,000 | 145,387,000 | $ 52,162,000 |
Individually evaluated | 14,168,000 | 5,080,000 | 14,168,000 | 5,080,000 |  |
Collectively evaluated | 158,186,000 | 140,307,000 | 158,186,000 | 140,307,000 |  |
Loans: |  |  |  |  |  |
Individually evaluated | 40,872,000 | 23,387,000 | 40,872,000 | 23,387,000 |  |
Collectively evaluated | 10,108,370,000 | 10,973,917,000 | 10,108,370,000 | 10,973,917,000 |  |
Gross loans | 10,149,242,000 | 10,997,304,000 | 10,149,242,000 | 10,997,304,000 |  | $ 10,933,647,000
Nonaccruing loans with no allowance for credit losses | 10,630,000 | 7,135,000 | 10,630,000 | 7,135,000 |  |
Commercial, financial, agricultural |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance | 37,592,000 | 25,937,000 | 39,031,000 | 10,658,000 |  |
Charge-offs | (1,184,000) | (1,156,000) | (4,682,000) | (1,549,000) |  |
Recoveries | 233,000 | 108,000 | 522,000 | 298,000 |  |
Net (charge-offs) recoveries | (951,000) | (1,048,000) | (4,160,000) | (1,251,000) |  |
Provision for credit losses on loans | 353,000 | 5,796,000 | 2,123,000 | 9,927,000 |  |
Ending balance | 36,994,000 | 30,685,000 | 36,994,000 | 30,685,000 | 10,658,000 |
Individually evaluated | 9,121,000 | 3,882,000 | 9,121,000 | 3,882,000 |  |
Collectively evaluated | 27,873,000 | 26,803,000 | 27,873,000 | 26,803,000 |  |
Loans: |  |  |  |  |  |
Individually evaluated | 14,409,000 | 9,736,000 | 14,409,000 | 9,736,000 |  |
Collectively evaluated | 1,620,224,000 | 2,631,862,000 | 1,620,224,000 | 2,631,862,000 |  |
Gross loans | 1,634,633,000 | 2,641,598,000 | 1,634,633,000 | 2,641,598,000 |  |
Nonaccruing loans with no allowance for credit losses | 2,826,000 | 720,000 | 2,826,000 | 720,000 |  |
Real estate – construction: |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance | 14,977,000 | 10,924,000 | 16,047,000 | 5,029,000 |  |
Charge-offs | 0 | (532,000) | (52,000) | (532,000) |  |
Recoveries | 0 | 0 | 13,000 | 0 |  |
Net (charge-offs) recoveries | 0 | (532,000) | (39,000) | (532,000) |  |
Provision for credit losses on loans | 752,000 | 2,146,000 | (279,000) | 4,536,000 |  |
Ending balance | 15,729,000 | 12,538,000 | 15,729,000 | 12,538,000 | 5,029,000 |
Individually evaluated | 0 | 0 | 0 | 0 |  |
Collectively evaluated | 15,729,000 | 12,538,000 | 15,729,000 | 12,538,000 |  |
Loans: |  |  |  |  |  |
Individually evaluated | 0 | 0 | 0 | 0 |  |
Collectively evaluated | 1,051,359,000 | 791,108,000 | 1,051,359,000 | 791,108,000 |  |
Gross loans | 1,051,359,000 | 791,108,000 | 1,051,359,000 | 791,108,000 |  |
Nonaccruing loans with no allowance for credit losses | 0 | 0 | 0 | 0 |  |
Real estate – 1-4 family mortgage: |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance | 31,694,000 | 27,320,000 | 32,165,000 | 9,814,000 |  |
Charge-offs | (152,000) | (142,000) | (253,000) | (363,000) |  |
Recoveries | 401,000 | 48,000 | 662,000 | 136,000 |  |
Net (charge-offs) recoveries | 249,000 | (94,000) | 409,000 | (227,000) |  |
Provision for credit losses on loans | (640,000) | 2,175,000 | (1,271,000) | 5,500,000 |  |
Ending balance | 31,303,000 | 29,401,000 | 31,303,000 | 29,401,000 | 9,814,000 |
Individually evaluated | 228,000 | 378,000 | 228,000 | 378,000 |  |
Collectively evaluated | 31,075,000 | 29,023,000 | 31,075,000 | 29,023,000 |  |
Loans: |  |  |  |  |  |
Individually evaluated | 5,017,000 | 5,142,000 | 5,017,000 | 5,142,000 |  |
Collectively evaluated | 2,697,074,000 | 2,783,371,000 | 2,697,074,000 | 2,783,371,000 |  |
Gross loans | 2,702,091,000 | 2,788,513,000 | 2,702,091,000 | 2,788,513,000 |  |
Nonaccruing loans with no allowance for credit losses | 2,841,000 | 2,503,000 | 2,841,000 | 2,503,000 |  |
Real estate – commercial mortgage: |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance | 76,225,000 | 44,237,000 | 76,127,000 | 24,990,000 |  |
Charge-offs | (171,000) | 0 | (232,000) | (2,047,000) |  |
Recoveries | 143,000 | 41,000 | 314,000 | 1,740,000 |  |
Net (charge-offs) recoveries | (28,000) | 41,000 | 82,000 | (307,000) |  |
Provision for credit losses on loans | (1,304,000) | 15,783,000 | (1,316,000) | 31,085,000 |  |
Ending balance | 74,893,000 | 60,061,000 | 74,893,000 | 60,061,000 | 24,990,000 |
Individually evaluated | 4,207,000 | 550,000 | 4,207,000 | 550,000 |  |
Collectively evaluated | 70,686,000 | 59,511,000 | 70,686,000 | 59,511,000 |  |
Loans: |  |  |  |  |  |
Individually evaluated | 20,810,000 | 7,883,000 | 20,810,000 | 7,883,000 |  |
Collectively evaluated | 4,509,359,000 | 4,402,870,000 | 4,509,359,000 | 4,402,870,000 |  |
Gross loans | 4,530,169,000 | 4,410,753,000 | 4,530,169,000 | 4,410,753,000 |  |
Nonaccruing loans with no allowance for credit losses | 4,953,000 | 3,910,000 | 4,953,000 | 3,910,000 |  |
Lease financing |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance | 1,546,000 |  | 1,624,000 | 910,000 |  |
Charge-offs | 0 | 0 | 0 | 0 |  |
Recoveries | 14,000 | 5,000 | 25,000 | 10,000 |  |
Net (charge-offs) recoveries | 14,000 | 5,000 | 25,000 | 10,000 |  |
Provision for credit losses on loans | (49,000) | 219,000 | (138,000) | 371,000 |  |
Ending balance | 1,511,000 | 1,812,000 | 1,511,000 | 1,812,000 | 910,000 |
Individually evaluated | 0 | 0 | 0 | 0 |  |
Collectively evaluated | 1,511,000 | 1,812,000 | 1,511,000 | 1,812,000 |  |
Loans: |  |  |  |  |  |
Individually evaluated | 0 | 0 | 0 | 0 |  |
Collectively evaluated | 74,003,000 | 80,779,000 | 74,003,000 | 80,779,000 |  |
Gross loans | 74,003,000 | 80,779,000 | 74,003,000 | 80,779,000 |  |
Nonaccruing loans with no allowance for credit losses | 0 | 0 | 0 | 0 |  |
Installment Loans to Individuals |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance | 11,072,000 | 10,179,000 | 11,150,000 | 761,000 |  |
Charge-offs | (1,347,000) | (1,736,000) | (3,005,000) | (4,424,000) |  |
Recoveries | 1,311,000 | 1,666,000 | 2,898,000 | 4,222,000 |  |
Net (charge-offs) recoveries | (36,000) | (70,000) | (107,000) | (202,000) |  |
Provision for credit losses on loans | 888,000 | 781,000 | 881,000 | 1,831,000 |  |
Ending balance | 11,924,000 | 10,890,000 | 11,924,000 | 10,890,000 | 761,000 |
Individually evaluated | 612,000 | 270,000 | 612,000 | 270,000 |  |
Collectively evaluated | 11,312,000 | 10,620,000 | 11,312,000 | 10,620,000 |  |
Loans: |  |  |  |  |  |
Individually evaluated | 636,000 | 626,000 | 636,000 | 626,000 |  |
Collectively evaluated | 156,351,000 | 283,927,000 | 156,351,000 | 283,927,000 |  |
Gross loans | 156,987,000 | 284,553,000 | 156,987,000 | 284,553,000 |  |
Nonaccruing loans with no allowance for credit losses | $ 10,000 | $ 2,000 | $ 10,000 | 2,000 |  |
Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance |  |  |  | 42,484,000 |  |
Ending balance |  |  |  |  | 42,484,000 |
Cumulative Effect, Period Of Adoption, Adjustment | Commercial, financial, agricultural |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance |  |  |  | 11,351,000 |  |
Ending balance |  |  |  |  | 11,351,000 |
Cumulative Effect, Period Of Adoption, Adjustment | Real estate – construction: |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance |  |  |  | 3,505,000 |  |
Ending balance |  |  |  |  | 3,505,000 |
Cumulative Effect, Period Of Adoption, Adjustment | Real estate – 1-4 family mortgage: |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance |  |  |  | 14,314,000 |  |
Ending balance |  |  |  |  | 14,314,000 |
Cumulative Effect, Period Of Adoption, Adjustment | Real estate – commercial mortgage: |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance |  |  |  | 4,293,000 |  |
Ending balance |  |  |  |  | 4,293,000 |
Cumulative Effect, Period Of Adoption, Adjustment | Lease financing |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance |  |  |  | 521,000 |  |
Ending balance |  |  |  |  | 521,000 |
Cumulative Effect, Period Of Adoption, Adjustment | Installment Loans to Individuals |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Beginning balance |  |  |  | $ 8,500,000 |  |
Ending balance |  |  |  |  | $ 8,500,000 |

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