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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | $ 58,719 | $ 59,075 | $ 59,093 | $ 54,655 | $ 54,655
Initial allowance on loans purchased with credit deterioration | 3,791 |  | 3,791 | 863 |
Provision for credit loss expense | 5,911 | 142 | 5,552 | 4,001 | 4,806
Loans charged off | 521 | 833 | 1,581 | 2,178 | 2,950
Recoveries collected | 341 | 393 | 1,386 | 1,436 | 1,719
Allowance for credit losses, Ending Balance | 68,241 | 58,777 | 68,241 | 58,777 | 59,093
Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 863 | 863
Construction and Land Development | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 2,208 | 2,042 | 2,250 | 1,743 | 1,743
Initial allowance on loans purchased with credit deterioration | 308 |  | 308 | 272 |
Provision for credit loss expense | 219 | 1 | 191 | 30 | 137
Loans charged off | 0 | 0 | 14 | 2 | 2
Recoveries collected | 0 | 100 | 0 | 100 | 100
Allowance for credit losses, Ending Balance | 2,735 | 2,143 | 2,735 | 2,143 | 2,250
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 |  |  |  | 272 | 272
Agricultural | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,370 | 2,112 | 1,433 | 1,257 | 1,257
Initial allowance on loans purchased with credit deterioration | 0 |  | 0 | 0 |
Provision for credit loss expense | 27 | (674) | (36) | 181 | 176
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,397 | 1,438 | 1,397 | 1,438 | 1,433
Agricultural | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 0 | 0
Residential Properties | Real Estate Loan | 1-4 Family |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 3,247 | 3,523 | 3,742 | 2,330 | 2,330
Initial allowance on loans purchased with credit deterioration | 124 |  | 124 | 3 |
Provision for credit loss expense | 629 | 269 | 88 | 1,355 | 1,241
Loans charged off | 21 | 45 | 77 | 186 | 191
Recoveries collected | 91 | 19 | 193 | 264 | 359
Allowance for credit losses, Ending Balance | 4,070 | 3,766 | 4,070 | 3,766 | 3,742
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 |  |  |  | 3 | 3
Commercial | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 28,014 | 28,856 | 28,157 | 26,246 | 26,246
Initial allowance on loans purchased with credit deterioration | 1,066 |  | 1,066 | 478 |
Provision for credit loss expense | 2,727 | (796) | 2,278 | 1,384 | 1,462
Loans charged off | 0 | 7 | 25 | 414 | 414
Recoveries collected | 16 | 8 | 347 | 367 | 385
Allowance for credit losses, Ending Balance | 31,823 | 28,061 | 31,823 | 28,061 | 28,157
Commercial | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 478 | 478
Agricultural Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 524 | 886 | 585 | 983 | 983
Initial allowance on loans purchased with credit deterioration | 0 |  | 0 | 0 |
Provision for credit loss expense | 245 | (246) | 450 | (250) | (359)
Loans charged off | 132 | 0 | 408 | 93 | 93
Recoveries collected | 3 | 38 | 13 | 38 | 54
Allowance for credit losses, Ending Balance | 640 | 678 | 640 | 678 | 585
Agricultural Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 0 | 0
Commercial and Industrial Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 21,544 | 19,496 | 20,808 | 19,241 | 19,241
Initial allowance on loans purchased with credit deterioration | 2,273 |  | 2,273 | 94 |
Provision for credit loss expense | 1,697 | 1,271 | 2,202 | 1,343 | 2,135
Loans charged off | 0 | 389 | 62 | 424 | 870
Recoveries collected | 81 | 63 | 374 | 187 | 208
Allowance for credit losses, Ending Balance | 25,595 | 20,441 | 25,595 | 20,441 | 20,808
Commercial and Industrial Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | 94 | 94
Consumer Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,812 | 2,160 | 2,118 | 2,855 | 2,855
Initial allowance on loans purchased with credit deterioration | 20 |  | 20 | 16 |
Provision for credit loss expense | 367 | 317 | 379 | (42) | 14
Loans charged off | 368 | 392 | 995 | 1,059 | 1,380
Recoveries collected | 150 | 165 | 459 | 480 | 613
Allowance for credit losses, Ending Balance | $ 1,981 | $ 2,250 | $ 1,981 | 2,250 | 2,118
Consumer Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  |  | $ 16 | $ 16

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