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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | $ 54,597 | $ 38,381 | $ 41,910 | $ 26,911 | $ 26,911
Initial allowance on loans purchased with credit deterioration |  |  | 2,074 |  |
Provision for credit loss expense | 1,103 | 3,883 | 12,679 | 15,500 | 16,103
Loans charged off | 2,076 | 556 | 3,493 | 2,942 | 3,844
Recoveries collected | 359 | 207 | 813 | 774 | 1,068
Allowance for credit losses, Ending Balance | 53,983 | 41,915 | 53,983 | 41,915 | 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 | 1,795 | 2,358 | 1,666 | 1,146 | 1,146
Initial allowance on loans purchased with credit deterioration |  |  | 261 |  |
Provision for credit loss expense | 314 | (139) | 205 | 1,186 | 646
Loans charged off | 0 | 13 | 23 | 13 | 13
Recoveries collected | 0 | 0 | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 2,109 | 2,206 | 2,109 | 2,206 | 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 | 1,665 | 1,634 | 1,084 | 1,093 | 1,093
Initial allowance on loans purchased with credit deterioration |  |  | 44 |  |
Provision for credit loss expense | (408) | 32 | 129 | 343 | (239)
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,257 | 1,666 | 1,257 | 1,666 | 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 | 2,570 | 2,486 | 2,322 | 1,386 | 1,386
Initial allowance on loans purchased with credit deterioration |  |  | 328 |  |
Provision for credit loss expense | 27 | (71) | 117 | 335 | 274
Loans charged off | 45 | 48 | 241 | 313 | 393
Recoveries collected | 108 | 24 | 134 | 227 | 299
Allowance for credit losses, Ending Balance | 2,660 | 2,391 | 2,660 | 2,391 | 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 | 25,664 | 16,272 | 19,660 | 11,198 | 11,198
Initial allowance on loans purchased with credit deterioration |  |  | 646 |  |
Provision for credit loss expense | (52) | 2,463 | 5,764 | 7,542 | 8,581
Loans charged off | 55 | 0 | 535 | 551 | 829
Recoveries collected | 23 | 73 | 45 | 78 | 169
Allowance for credit losses, Ending Balance | 25,580 | 18,808 | 25,580 | 18,808 | 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 | 906 | 1,323 | 1,526 | 1,386 | 1,386
Initial allowance on loans purchased with credit deterioration |  |  | 0 |  |
Provision for credit loss expense | (90) | (89) | (711) | 211 | 503
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 0 | 0 | 1 | 0 | 0
Allowance for credit losses, Ending Balance | 816 | 1,234 | 816 | 1,234 | 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 | 19,842 | 12,360 | 13,485 | 9,273 | 9,273
Initial allowance on loans purchased with credit deterioration |  |  | 795 |  |
Provision for credit loss expense | 342 | 1,352 | 5,950 | 5,453 | 5,869
Loans charged off | 1,600 | 368 | 1,686 | 1,651 | 1,991
Recoveries collected | 24 | 28 | 64 | 142 | 179
Allowance for credit losses, Ending Balance | 18,608 | 13,372 | 18,608 | 13,372 | 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 | 2,155 | 1,948 | 2,167 | 1,429 | 1,429
Initial allowance on loans purchased with credit deterioration |  |  | 0 |  |
Provision for credit loss expense | 970 | 335 | 1,225 | 430 | 469
Loans charged off | 376 | 127 | 1,008 | 414 | 618
Recoveries collected | 204 | 82 | 569 | 327 | 421
Allowance for credit losses, Ending Balance | $ 2,953 | $ 2,238 | $ 2,953 | 2,238 | 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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