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Loans and Allowance for Loan Losses - Allowance for Credit Losses Based on Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | $ 38,381 | $ 26,359 | $ 26,911 | $ 26,189 | $ 26,189
Provision for credit loss expense | 3,883 | 2,658 | 15,500 | 3,696 | 6,433
Loans charged off | 556 | 2,460 | 2,942 | 3,570 | 6,326
Recoveries collected | 207 | 184 | 774 | 426 | 615
Ending balance | 41,915 | 26,741 | 41,915 | 26,741 | 26,911
Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  | 1,672 |  |
Ending balance |  |  |  |  | 1,672
Construction and Land Development | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 2,358 | 739 | 1,146 | 561 | 561
Provision for credit loss expense | (139) | 759 | 1,186 | 937 | 585
Loans charged off | 13 | 0 | 13 | 0 | 0
Recoveries collected | 0 | 0 | 0 | 0 | 0
Ending balance | 2,206 | 1,498 | 2,206 | 1,498 | 1,146
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) |  |
Ending balance |  |  |  |  | (113)
Agricultural | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,634 | 1,284 | 1,093 | 1,246 | 1,246
Provision for credit loss expense | 32 | (134) | 343 | (96) | (153)
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0 | 0 | 0
Ending balance | 1,666 | 1,150 | 1,666 | 1,150 | 1,093
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 |  |
Ending balance |  |  |  |  | 230
Residential Properties | Real Estate Loan | 1-4 Family |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 2,486 | 1,649 | 1,386 | 1,504 | 1,504
Provision for credit loss expense | (71) | 618 | 335 | 944 | 1,268
Loans charged off | 48 | 514 | 313 | 711 | 1,478
Recoveries collected | 24 | 59 | 227 | 75 | 92
Ending balance | 2,391 | 1,812 | 2,391 | 1,812 | 1,386
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 |  |
Ending balance |  |  |  |  | 756
Commercial | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 16,272 | 10,796 | 11,198 | 11,102 | 11,102
Provision for credit loss expense | 2,463 | 229 | 7,542 | 83 | 1,827
Loans charged off | 0 | 866 | 551 | 1,027 | 1,743
Recoveries collected | 73 | 5 | 78 | 6 | 12
Ending balance | 18,808 | 10,164 | 18,808 | 10,164 | 11,198
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 |  |
Ending balance |  |  |  |  | 541
Agricultural Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,323 | 1,672 | 1,386 | 951 | 951
Provision for credit loss expense | (89) | (87) | 211 | 642 | 459
Loans charged off | 0 | 15 | 0 | 23 | 24
Recoveries collected | 0 | 0 | 0 | 0 | 0
Ending balance | 1,234 | 1,570 | 1,234 | 1,570 | 1,386
Agricultural Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  | (363) |  |
Ending balance |  |  |  |  | (363)
Commercial And Industrial Portfolio Segment |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 12,360 | 9,130 | 9,273 | 9,893 | 9,893
Provision for credit loss expense | 1,352 | 791 | 5,453 | 246 | 1,053
Loans charged off | 368 | 724 | 1,651 | 982 | 1,828
Recoveries collected | 28 | 47 | 142 | 87 | 155
Ending balance | 13,372 | 9,244 | 13,372 | 9,244 | 9,273
Commercial And Industrial Portfolio Segment | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  | 155 |  |
Ending balance |  |  |  |  | 155
Consumer Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,948 | 1,089 | 1,429 | 932 | 932
Provision for credit loss expense | 335 | 482 | 430 | 940 | 1,394
Loans charged off | 127 | 341 | 414 | 827 | 1,253
Recoveries collected | 82 | 73 | 327 | 258 | 356
Ending balance | $ 2,238 | $ 1,303 | 2,238 | $ 1,303 | 1,429
Consumer Loans | Cumulative Change in Accounting Principal, Adjustment | ASU 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance |  |  | $ 466 |  |
Ending balance |  |  |  |  | $ 466

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