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Loans and Allowance for Loan Losses - Credit Risk Profile of Loan Portfolio on Amortized Cost Basis Based on Risk Rating Category (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Credit Quality Information [Abstract] |  |
2020 | $ 725,052 |
2019 | 616,209 |
2018 | 395,745 |
2017 | 357,400 |
2016 | 296,452 |
Prior | 785,890 |
Revolving Loans | 28,514 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 3,205,262 | $ 2,695,347
Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 708,239 |
2019 | 564,549 |
2018 | 385,866 |
2017 | 347,120 |
2016 | 281,055 |
Prior | 738,929 |
Revolving Loans | 27,209 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 3,052,967 | 2,558,157
Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 13,758 |
2019 | 48,217 |
2018 | 5,393 |
2017 | 3,044 |
2016 | 8,403 |
Prior | 17,601 |
Revolving Loans | 30 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 96,446 | 71,611
Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 3,055 |
2019 | 3,443 |
2018 | 4,486 |
2017 | 7,236 |
2016 | 6,994 |
Prior | 29,360 |
Revolving Loans | 1,275 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 55,849 | 65,579
Agricultural Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 82,479 |
2019 | 49,604 |
2018 | 8,674 |
2017 | 3,180 |
2016 | 1,660 |
Prior | 3,446 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 149,043 | 136,124
Agricultural Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 72,118 |
2019 | 38,483 |
2018 | 8,353 |
2017 | 3,169 |
2016 | 959 |
Prior | 3,400 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 126,482 | 129,811
Agricultural Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 9,754 |
2019 | 11,078 |
2018 | 296 |
2017 | 11 |
2016 | 701 |
Prior | 35 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 21,875 | 3,862
Agricultural Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 607 |
2019 | 43 |
2018 | 25 |
2017 | 0 |
2016 | 0 |
Prior | 11 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 686 | 2,451
Commercial and Industrial Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 365,002 |
2019 | 184,651 |
2018 | 101,333 |
2017 | 86,401 |
2016 | 56,508 |
Prior | 141,333 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 935,228 | 655,580
Commercial and Industrial Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 362,238 |
2019 | 148,476 |
2018 | 100,766 |
2017 | 84,972 |
2016 | 55,893 |
Prior | 138,743 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 891,088 | 603,047
Commercial and Industrial Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 1,642 |
2019 | 33,847 |
2018 | 185 |
2017 | 58 |
2016 | 407 |
Prior | 952 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 37,091 | 40,395
Commercial and Industrial Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 1,122 |
2019 | 2,328 |
2018 | 382 |
2017 | 1,371 |
2016 | 208 |
Prior | 1,638 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 7,049 | 12,138
Consumer Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 20,138 |
2019 | 30,769 |
2018 | 17,885 |
2017 | 10,277 |
2016 | 1,248 |
Prior | 1,767 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 82,084 | 83,183
Consumer Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 20,116 |
2019 | 30,739 |
2018 | 17,657 |
2017 | 10,147 |
2016 | 148 |
Prior | 9 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 78,816 | 82,117
Consumer Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 5 |
2019 | 0 |
2018 | 72 |
2017 | 1 |
2016 | 960 |
Prior | 1,154 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 2,192 | 140
Consumer Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 17 |
2019 | 30 |
2018 | 156 |
2017 | 129 |
2016 | 140 |
Prior | 604 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,076 | 926
Real Estate Loan |  |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 2,038,907 | 1,820,460
Real Estate Loan | Pass |  |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable |  | 1,743,182
Real Estate Loan | Special Mention |  |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable |  | 27,214
Real Estate Loan | Substandard |  |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable |  | 50,064
Real Estate Loan | Construction and Land Development |  |
Credit Quality Information [Abstract] |  |
2020 | 56,357 |
2019 | 61,726 |
2018 | 4,145 |
2017 | 3,380 |
2016 | 909 |
Prior | 54,417 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 180,934 | 94,142
Real Estate Loan | Construction and Land Development | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 56,357 |
2019 | 61,418 |
2018 | 4,145 |
2017 | 2,848 |
2016 | 519 |
Prior | 54,361 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 179,648 | 93,413
Real Estate Loan | Construction and Land Development | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 390 |
Prior | 0 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 390 | 413
Real Estate Loan | Construction and Land Development | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 308 |
2018 | 0 |
2017 | 532 |
2016 | 0 |
Prior | 56 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 896 | 316
Real Estate Loan | Agricultural |  |
Credit Quality Information [Abstract] |  |
2020 | 45,176 |
2019 | 45,995 |
2018 | 44,171 |
2017 | 18,639 |
2016 | 16,882 |
Prior | 80,519 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 251,382 | 240,241
Real Estate Loan | Agricultural | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 44,876 |
2019 | 42,885 |
2018 | 43,297 |
2017 | 18,278 |
2016 | 15,940 |
Prior | 69,084 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 234,360 | 231,227
Real Estate Loan | Agricultural | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 300 |
2019 | 3,110 |
2018 | 387 |
2017 | 143 |
2016 | 875 |
Prior | 11,186 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 16,001 | 6,902
Real Estate Loan | Agricultural | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 0 |
2018 | 487 |
2017 | 218 |
2016 | 67 |
Prior | 249 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,021 | 2,112
Real Estate Loan | Commercial |  |
Credit Quality Information [Abstract] |  |
2020 | 114,991 |
2019 | 206,281 |
2018 | 180,030 |
2017 | 202,156 |
2016 | 183,526 |
Prior | 377,571 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,264,555 | 1,149,650
Real Estate Loan | Commercial | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 111,880 |
2019 | 206,159 |
2018 | 174,472 |
2017 | 197,260 |
2016 | 174,120 |
Prior | 355,666 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,219,557 | 1,103,543
Real Estate Loan | Commercial | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 1,857 |
2019 | 23 |
2018 | 4,158 |
2017 | 1,781 |
2016 | 4,818 |
Prior | 2,822 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 15,459 | 14,156
Real Estate Loan | Commercial | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 1,254 |
2019 | 99 |
2018 | 1,400 |
2017 | 3,115 |
2016 | 4,588 |
Prior | 19,083 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 29,539 | 31,951
1-4 Family | Real Estate Loan | Residential Properties |  |
Credit Quality Information [Abstract] |  |
2020 | 40,909 |
2019 | 37,183 |
2018 | 39,507 |
2017 | 33,367 |
2016 | 35,719 |
Prior | 126,837 |
Revolving Loans | 28,514 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 342,036 | 336,427
1-4 Family | Real Estate Loan | Residential Properties | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 40,654 |
2019 | 36,389 |
2018 | 37,176 |
2017 | 30,446 |
2016 | 33,476 |
Prior | 117,666 |
Revolving Loans | 27,209 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 323,016 | 314,999
1-4 Family | Real Estate Loan | Residential Properties | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 200 |
2019 | 159 |
2018 | 295 |
2017 | 1,050 |
2016 | 252 |
Prior | 1,452 |
Revolving Loans | 30 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 3,438 | 5,743
1-4 Family | Real Estate Loan | Residential Properties | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 55 |
2019 | 635 |
2018 | 2,036 |
2017 | 1,871 |
2016 | 1,991 |
Prior | 7,719 |
Revolving Loans | 1,275 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | $ 15,582 | $ 15,685

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