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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | $ 32,876 | $ 26,704 | $ 26,911 | $ 26,189 | $ 26,189
Provision for credit loss expense | 6,136 | 91 | 11,617 | 1,038 | 6,433
Loans charged off | 963 | 542 | 2,386 | 1,110 | 6,326
Recoveries collected | 332 | 106 | 567 | 242 | 615
Ending balance | 38,381 | 26,359 | 38,381 | 26,359 | 26,911
Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | 1,672 |  |
Construction and Land Development | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,620 | 552 | 1,146 | 561 | 561
Provision for credit loss expense | 738 | 187 | 1,325 | 178 | 585
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0 | 0 | 0
Ending balance | 2,358 | 739 | 2,358 | 739 | 1,146
Construction and Land Development | Real Estate Loan | Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | (113) |  |
Agricultural | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,335 | 1,282 | 1,093 | 1,246 | 1,246
Provision for credit loss expense | 299 | 2 | 311 | 38 | (153)
Loans charged off | 0 | 0 | 0 | 0 | 0
Recoveries collected | 0 | 0 | 0 | 0 | 0
Ending balance | 1,634 | 1,284 | 1,634 | 1,284 | 1,093
Agricultural | Real Estate Loan | Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | 230 |  |
Residential Properties | Real Estate Loan | 1-4 Family |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,931 | 1,341 | 1,386 | 1,504 | 1,504
Provision for credit loss expense | 483 | 367 | 406 | 326 | 1,268
Loans charged off | 69 | 66 | 265 | 197 | 1,478
Recoveries collected | 141 | 7 | 203 | 16 | 92
Ending balance | 2,486 | 1,649 | 2,486 | 1,649 | 1,386
Residential Properties | Real Estate Loan | Accounting Standards Update 2016-13 | 1-4 Family |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | 756 |  |
Commercial | Real Estate Loan |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 13,621 | 10,565 | 11,198 | 11,102 | 11,102
Provision for credit loss expense | 3,118 | 335 | 5,079 | (146) | 1,827
Loans charged off | 467 | 105 | 551 | 161 | 1,743
Recoveries collected | 0 | 1 | 5 | 1 | 12
Ending balance | 16,272 | 10,796 | 16,272 | 10,796 | 11,198
Commercial | Real Estate Loan | Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | 541 |  |
Agricultural Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 1,064 | 1,130 | 1,386 | 951 | 951
Provision for credit loss expense | 259 | 542 | 300 | 730 | 459
Loans charged off | 0 | 0 | 0 | 9 | 24
Recoveries collected | 0 | 0 | 0 | 0 | 0
Ending balance | 1,323 | 1,672 | 1,323 | 1,672 | 1,386
Agricultural Loans | Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | (363) |  |
Commercial And Industrial Portfolio Segment |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 11,294 | 10,830 | 9,273 | 9,893 | 9,893
Provision for credit loss expense | 1,286 | (1,558) | 4,101 | (546) | 1,053
Loans charged off | 311 | 155 | 1,283 | 258 | 1,828
Recoveries collected | 91 | 12 | 114 | 40 | 155
Ending balance | 12,360 | 9,129 | 12,360 | 9,129 | 9,273
Commercial And Industrial Portfolio Segment | Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | 155 |  |
Consumer Loans |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Allowance for credit losses, Beginning Balance | 2,011 | 1,004 | 1,429 | 932 | 932
Provision for credit loss expense | (47) | 216 | 95 | 458 | 1,394
Loans charged off | 116 | 216 | 287 | 485 | 1,253
Recoveries collected | 100 | 86 | 245 | 185 | 356
Ending balance | $ 1,948 | $ 1,090 | 1,948 | $ 1,090 | $ 1,429
Consumer Loans | Accounting Standards Update 2016-13 |  |  |  |  |
Allowance for loan losses [Abstract] |  |  |  |  |
Impact of adopting ASU 2016-13 |  |  | $ 466 |  |

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