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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, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | $ 68,675 | $ 59,093 | $ 59,093
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 3,791
Provision for credit loss expense | (357) | (817) | 6,104
Loans charged off | 819 | 480 | 2,631
Recoveries collected | 437 | 427 | 2,318
Allowance for credit losses, Ending Balance | 67,936 | 58,223 | 68,675
Construction and Land Development | Real Estate Loan |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 2,918 | 2,250 | 2,250
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 308
Provision for credit loss expense | (217) | 176 | 374
Loans charged off | 0 | 0 | 14
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 2,701 | 2,426 | 2,918
Agricultural | Real Estate Loan |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 1,366 | 1,433 | 1,433
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 0
Provision for credit loss expense | (8) | (29) | (67)
Loans charged off | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,358 | 1,404 | 1,366
Residential Properties | Real Estate Loan | 1-4 Family |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 4,220 | 3,742 | 3,742
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 124
Provision for credit loss expense | (424) | (306) | 225
Loans charged off | 67 | 40 | 87
Recoveries collected | 49 | 24 | 216
Allowance for credit losses, Ending Balance | 3,778 | 3,420 | 4,220
Commercial | Real Estate Loan |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 31,758 | 28,157 | 28,157
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 1,066
Provision for credit loss expense | 618 | (834) | 1,755
Loans charged off | 0 | 0 | 25
Recoveries collected | 161 | 4 | 805
Allowance for credit losses, Ending Balance | 32,537 | 27,327 | 31,758
Agricultural Loans |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 705 | 585 | 585
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 0
Provision for credit loss expense | 125 | (8) | 490
Loans charged off | 52 | 0 | 408
Recoveries collected | 0 | 3 | 38
Allowance for credit losses, Ending Balance | 778 | 580 | 705
Commercial and Industrial Loans |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 25,450 | 20,808 | 20,808
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 2,273
Provision for credit loss expense | (609) | 91 | 2,322
Loans charged off | 274 | 13 | 529
Recoveries collected | 64 | 256 | 576
Allowance for credit losses, Ending Balance | 24,631 | 21,142 | 25,450
Consumer Loans |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 2,258 | 2,118 | 2,118
Initial allowance on loans purchased with credit deterioration | 0 | 0 | 20
Provision for credit loss expense | 158 | 93 | 1,005
Loans charged off | 426 | 427 | 1,568
Recoveries collected | 163 | 140 | 683
Allowance for credit losses, Ending Balance | $ 2,153 | $ 1,924 | $ 2,258

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