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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, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | $ 41,910 | $ 26,911 | $ 26,911
Initial allowance on loans purchased with credit deterioration | 2,074 |  |
Provision for credit loss expense | 12,136 | 5,481 | 16,103
Loans charged off | 968 | 1,423 | 3,844
Recoveries collected | 266 | 235 | 1,068
Allowance for credit losses, Ending Balance | 55,418 | 32,876 | 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 | 1,666 | 1,146 | 1,146
Initial allowance on loans purchased with credit deterioration | 261 |  |
Provision for credit loss expense | 359 | 587 | 646
Loans charged off | 0 | 0 | 13
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 2,286 | 1,620 | 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 | 1,084 | 1,093 | 1,093
Initial allowance on loans purchased with credit deterioration | 44 |  |
Provision for credit loss expense | 500 | 12 | (239)
Loans charged off | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,628 | 1,335 | 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 | 2,322 | 1,386 | 1,386
Initial allowance on loans purchased with credit deterioration | 328 |  |
Provision for credit loss expense | 617 | (77) | 274
Loans charged off | 182 | 196 | 393
Recoveries collected | 8 | 62 | 299
Allowance for credit losses, Ending Balance | 3,093 | 1,931 | 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 | 19,660 | 11,198 | 11,198
Initial allowance on loans purchased with credit deterioration | 646 |  |
Provision for credit loss expense | 5,902 | 1,961 | 8,581
Loans charged off | 480 | 84 | 829
Recoveries collected | 9 | 5 | 169
Allowance for credit losses, Ending Balance | 25,737 | 13,621 | 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 | 1,526 | 1,386 | 1,386
Initial allowance on loans purchased with credit deterioration | 0 |  |
Provision for credit loss expense | (645) | 41 | 503
Loans charged off | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 881 | 1,064 | 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 | 13,485 | 9,273 | 9,273
Initial allowance on loans purchased with credit deterioration | 795 |  |
Provision for credit loss expense | 4,674 | 2,815 | 5,869
Loans charged off | 18 | 972 | 1,991
Recoveries collected | 18 | 23 | 179
Allowance for credit losses, Ending Balance | 18,954 | 11,294 | 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 | 2,167 | 1,429 | 1,429
Initial allowance on loans purchased with credit deterioration | 0 |  |
Provision for credit loss expense | 729 | 142 | 469
Loans charged off | 288 | 171 | 618
Recoveries collected | 231 | 145 | 421
Allowance for credit losses, Ending Balance | $ 2,839 | 2,011 | 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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