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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | $ 59,093 | $ 54,655 | $ 54,655
Initial allowance on loans purchased with credit deterioration | 0 | 863 |
Provision for credit loss expense | (817) | 2,952 | 4,806
Loans charged off | 480 | 774 | 2,950
Recoveries collected | 427 | 778 | 1,719
Allowance for credit losses, Ending Balance | 58,223 | 58,474 | 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 | 2,250 | 1,743 | 1,743
Initial allowance on loans purchased with credit deterioration | 0 | 272 |
Provision for credit loss expense | 176 | (25) | 137
Loans charged off | 0 | 2 | 2
Recoveries collected | 0 | 0 | 100
Allowance for credit losses, Ending Balance | 2,426 | 1,988 | 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 | 1,433 | 1,257 | 1,257
Initial allowance on loans purchased with credit deterioration | 0 | 0 |
Provision for credit loss expense | (29) | 714 | 176
Loans charged off | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,404 | 1,971 | 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 | 3,742 | 2,330 | 2,330
Initial allowance on loans purchased with credit deterioration | 0 | 3 |
Provision for credit loss expense | (306) | 1,264 | 1,241
Loans charged off | 40 | 72 | 191
Recoveries collected | 24 | 203 | 359
Allowance for credit losses, Ending Balance | 3,420 | 3,728 | 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 | 28,157 | 26,246 | 26,246
Initial allowance on loans purchased with credit deterioration | 0 | 478 |
Provision for credit loss expense | (834) | 3,613 | 1,462
Loans charged off | 0 | 339 | 414
Recoveries collected | 4 | 347 | 385
Allowance for credit losses, Ending Balance | 27,327 | 30,345 | 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 | 585 | 983 | 983
Initial allowance on loans purchased with credit deterioration | 0 | 0 |
Provision for credit loss expense | (8) | 68 | (359)
Loans charged off | 0 | 0 | 93
Recoveries collected | 3 | 0 | 54
Allowance for credit losses, Ending Balance | 580 | 1,051 | 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 | 20,808 | 19,241 | 19,241
Initial allowance on loans purchased with credit deterioration | 0 | 94 |
Provision for credit loss expense | 91 | (2,045) | 2,135
Loans charged off | 13 | 3 | 870
Recoveries collected | 256 | 61 | 208
Allowance for credit losses, Ending Balance | 21,142 | 17,348 | 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 | 2,118 | 2,855 | 2,855
Initial allowance on loans purchased with credit deterioration | 0 | 16 |
Provision for credit loss expense | 93 | (637) | 14
Loans charged off | 427 | 358 | 1,380
Recoveries collected | 140 | 167 | 613
Allowance for credit losses, Ending Balance | $ 1,924 | 2,043 | 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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