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Loans and Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | $ 26,911 | $ 26,189 | $ 19,977
Provision for credit loss expense | 16,103 | 6,433 | 8,667
Loans charged off | 3,844 | 6,326 | 2,993
Recoveries collected | 1,068 | 615 | 538
Allowance for credit losses, Ending Balance | 41,910 | 26,911 | 26,189
Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 1,672 |  |
Allowance for credit losses, Ending Balance |  | 1,672 |
Construction and Land Development | Real Estate Loan |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 1,146 | 561 | 1,202
Provision for credit loss expense | 646 | 585 | (631)
Loans charged off | 13 | 0 | 10
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,666 | 1,146 | 561
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) |  |
Allowance for credit losses, Ending Balance |  | (113) |
Agricultural | Real Estate Loan |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 1,093 | 1,246 | 1,001
Provision for credit loss expense | (239) | (153) | 245
Loans charged off | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,084 | 1,093 | 1,246
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 |  |
Allowance for credit losses, Ending Balance |  | 230 |
Residential Properties | Real Estate Loan | 1-4 Family |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 1,386 | 1,504 | 886
Provision for credit loss expense | 274 | 1,268 | 1,628
Loans charged off | 393 | 1,478 | 1,111
Recoveries collected | 299 | 92 | 101
Allowance for credit losses, Ending Balance | 2,322 | 1,386 | 1,504
Residential Properties | Real Estate Loan | Cumulative Change in Accounting Principal, Adjustment | 1-4 Family | ASU 2016-13 |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 756 |  |
Allowance for credit losses, Ending Balance |  | 756 |
Commercial | Real Estate Loan |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 11,198 | 11,102 | 7,918
Provision for credit loss expense | 8,581 | 1,827 | 3,353
Loans charged off | 829 | 1,743 | 170
Recoveries collected | 169 | 12 | 1
Allowance for credit losses, Ending Balance | 19,660 | 11,198 | 11,102
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 |  |
Allowance for credit losses, Ending Balance |  | 541 |
Agricultural Loans |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 1,386 | 951 | 743
Provision for credit loss expense | 503 | 459 | 301
Loans charged off | 0 | 24 | 93
Recoveries collected | 0 | 0 | 0
Allowance for credit losses, Ending Balance | 1,526 | 1,386 | 951
Agricultural Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | (363) |  |
Allowance for credit losses, Ending Balance |  | (363) |
Commercial and Industrial Loans |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 9,273 | 9,893 | 7,425
Provision for credit loss expense | 5,869 | 1,053 | 3,155
Loans charged off | 1,991 | 1,828 | 832
Recoveries collected | 179 | 155 | 145
Allowance for credit losses, Ending Balance | 13,485 | 9,273 | 9,893
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 |  |
Allowance for credit losses, Ending Balance |  | 155 |
Consumer Loans |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | 1,429 | 932 | 802
Provision for credit loss expense | 469 | 1,394 | 616
Loans charged off | 618 | 1,253 | 777
Recoveries collected | 421 | 356 | 291
Allowance for credit losses, Ending Balance | 2,167 | 1,429 | $ 932
Consumer Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |
Allowance for loan losses [Abstract] |  |  |
Allowance for credit losses, Beginning Balance | $ 466 |  |
Allowance for credit losses, Ending Balance |  | $ 466 |

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