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Loans and Allowance for Credit Losses - Allowance for Credit Losses Based on Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | $ 55,418 | $ 32,876 | $ 41,910 | $ 26,911 | $ 26,911
Initial allowance on loans purchased with credit deterioration | 0 |  | 2,074 |  |
Provision for credit loss expense | (560) | 6,136 | 11,576 | 11,617 | 16,103
Loans charged off | 449 | 963 | 1,417 | 2,386 | 3,844
Recoveries collected | 188 | 332 | 454 | 567 | 1,068
Allowance for credit losses, Ending Balance | 54,597 | 38,381 | 54,597 | 38,381 | 41,910
Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 1,672 | 1,672
Construction and Land Development | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 2,286 | 1,620 | 1,666 | 1,146 | 1,146
Initial allowance on loans purchased with credit deterioration | 0 |  | 261 |  |
Provision for credit loss expense | (468) | 738 | (109) | 1,325 | 646
Loans charged off | 23 | 0 | 23 | 0 | 13
Recoveries collected | 0 | 0 | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,795 | 2,358 | 1,795 | 2,358 | 1,666
Construction and Land Development | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | (113) | (113)
Agricultural | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,628 | 1,335 | 1,084 | 1,093 | 1,093
Initial allowance on loans purchased with credit deterioration | 0 |  | 44 |  |
Provision for credit loss expense | 37 | 299 | 535 | 311 | (239)
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 0 | 0 | 2 | 0 | 0
Allowance for credit losses, Ending Balance | 1,665 | 1,634 | 1,665 | 1,634 | 1,084
Agricultural | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 230 | 230
Residential Properties | Real Estate Loan | 1-4 Family |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 3,093 | 1,931 | 2,322 | 1,386 | 1,386
Initial allowance on loans purchased with credit deterioration | 0 |  | 328 |  |
Provision for credit loss expense | (527) | 483 | 90 | 406 | 274
Loans charged off | 14 | 69 | 196 | 265 | 393
Recoveries collected | 18 | 141 | 26 | 203 | 299
Allowance for credit losses, Ending Balance | 2,570 | 2,486 | 2,570 | 2,486 | 2,322
Residential Properties | Real Estate Loan | 1-4 Family | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 756 | 756
Commercial | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 25,737 | 13,621 | 19,660 | 11,198 | 11,198
Initial allowance on loans purchased with credit deterioration | 0 |  | 646 |  |
Provision for credit loss expense | (86) | 3,118 | 5,816 | 5,079 | 8,581
Loans charged off | 0 | 467 | 480 | 551 | 829
Recoveries collected | 13 | 0 | 22 | 5 | 169
Allowance for credit losses, Ending Balance | 25,664 | 16,272 | 25,664 | 16,272 | 19,660
Commercial | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 541 | 541
Agricultural Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 881 | 1,064 | 1,526 | 1,386 | 1,386
Initial allowance on loans purchased with credit deterioration | 0 |  | 0 |  |
Provision for credit loss expense | 24 | 259 | (621) | 300 | 503
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 1 | 0 | 1 | 0 | 0
Allowance for credit losses, Ending Balance | 906 | 1,323 | 906 | 1,323 | 1,526
Agricultural Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | (363) | (363)
Commercial and Industrial Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 18,954 | 11,294 | 13,485 | 9,273 | 9,273
Initial allowance on loans purchased with credit deterioration | 0 |  | 795 |  |
Provision for credit loss expense | 934 | 1,286 | 5,608 | 4,101 | 5,869
Loans charged off | 68 | 311 | 86 | 1,283 | 1,991
Recoveries collected | 22 | 91 | 40 | 114 | 179
Allowance for credit losses, Ending Balance | 19,842 | 12,360 | 19,842 | 12,360 | 13,485
Commercial and Industrial Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 155 | 155
Consumer Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 2,839 | 2,011 | 2,167 | 1,429 | 1,429
Initial allowance on loans purchased with credit deterioration | 0 |  | 0 |  |
Provision for credit loss expense | (474) | (47) | 257 | 95 | 469
Loans charged off | 344 | 116 | 632 | 287 | 618
Recoveries collected | 134 | 100 | 363 | 245 | 421
Allowance for credit losses, Ending Balance | $ 2,155 | $ 1,948 | $ 2,155 | 1,948 | 2,167
Consumer Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | $ 466 | $ 466

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