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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 | Sep. 30, 2020 | Dec. 31, 2019
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Credit Quality Information [Abstract] |  |
2020 | $ 986,624 |
2019 | 586,488 |
2018 | 412,756 |
2017 | 340,713 |
2016 | 289,752 |
Prior | 587,961 |
Revolving Loans | 31,953 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 3,236,247 | $ 2,695,347
Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 958,706 |
2019 | 541,886 |
2018 | 395,462 |
2017 | 330,776 |
2016 | 275,065 |
Prior | 543,021 |
Revolving Loans | 30,391 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 3,075,307 | 2,558,157
Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 24,749 |
2019 | 40,863 |
2018 | 12,487 |
2017 | 2,879 |
2016 | 7,763 |
Prior | 16,798 |
Revolving Loans | 310 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 105,849 | 71,611
Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 3,169 |
2019 | 3,739 |
2018 | 4,807 |
2017 | 7,058 |
2016 | 6,924 |
Prior | 28,142 |
Revolving Loans | 1,252 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 55,091 | 65,579
Agricultural Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 96,923 |
2019 | 29,917 |
2018 | 7,855 |
2017 | 2,494 |
2016 | 1,007 |
Prior | 2,878 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 141,074 | 136,124
Agricultural Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 77,482 |
2019 | 24,639 |
2018 | 7,235 |
2017 | 2,487 |
2016 | 800 |
Prior | 2,856 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 115,499 | 129,811
Agricultural Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 18,818 |
2019 | 5,237 |
2018 | 595 |
2017 | 7 |
2016 | 207 |
Prior | 22 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 24,886 | 3,862
Agricultural Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 623 |
2019 | 41 |
2018 | 25 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 689 | 2,451
Commercial and Industrial Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 431,194 |
2019 | 169,174 |
2018 | 76,734 |
2017 | 81,948 |
2016 | 46,212 |
Prior | 129,820 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 935,082 | 655,580
Commercial and Industrial Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 427,402 |
2019 | 134,753 |
2018 | 76,051 |
2017 | 80,506 |
2016 | 45,685 |
Prior | 127,547 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 891,944 | 603,047
Commercial and Industrial Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 2,790 |
2019 | 31,962 |
2018 | 189 |
2017 | 141 |
2016 | 343 |
Prior | 1,111 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 36,536 | 40,395
Commercial and Industrial Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 1,002 |
2019 | 2,459 |
2018 | 494 |
2017 | 1,301 |
2016 | 184 |
Prior | 1,162 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 6,602 | 12,138
Consumer Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 26,072 |
2019 | 24,452 |
2018 | 14,238 |
2017 | 9,902 |
2016 | 4,044 |
Prior | 1,640 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 80,348 | 83,183
Consumer Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 26,068 |
2019 | 24,420 |
2018 | 14,086 |
2017 | 9,794 |
2016 | 3,014 |
Prior | 332 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 77,714 | 82,117
Consumer Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 4 |
2019 | 0 |
2018 | 39 |
2017 | 1 |
2016 | 949 |
Prior | 1,172 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 2,165 | 140
Consumer Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 32 |
2018 | 113 |
2017 | 107 |
2016 | 81 |
Prior | 136 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 469 | 926
Real Estate Loan |  |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 2,079,743 | 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 | 61,198 |
2019 | 67,874 |
2018 | 29,449 |
2017 | 3,329 |
2016 | 1,041 |
Prior | 4,624 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 167,515 | 94,142
Real Estate Loan | Construction and Land Development | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 61,198 |
2019 | 67,437 |
2018 | 29,449 |
2017 | 2,805 |
2016 | 1,041 |
Prior | 4,571 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 166,501 | 93,413
Real Estate Loan | Construction and Land Development | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 0 | 413
Real Estate Loan | Construction and Land Development | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 437 |
2018 | 0 |
2017 | 524 |
2016 | 0 |
Prior | 53 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,014 | 316
Real Estate Loan | Agricultural |  |
Credit Quality Information [Abstract] |  |
2020 | 63,279 |
2019 | 39,645 |
2018 | 42,585 |
2017 | 17,564 |
2016 | 15,871 |
Prior | 77,286 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 256,230 | 240,241
Real Estate Loan | Agricultural | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 62,248 |
2019 | 36,161 |
2018 | 41,540 |
2017 | 17,210 |
2016 | 14,940 |
Prior | 66,631 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 238,730 | 231,227
Real Estate Loan | Agricultural | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 1,031 |
2019 | 3,484 |
2018 | 558 |
2017 | 140 |
2016 | 874 |
Prior | 10,408 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 16,495 | 6,902
Real Estate Loan | Agricultural | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 0 |
2018 | 487 |
2017 | 214 |
2016 | 57 |
Prior | 247 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,005 | 2,112
Real Estate Loan | Commercial |  |
Credit Quality Information [Abstract] |  |
2020 | 240,088 |
2019 | 220,546 |
2018 | 198,261 |
2017 | 194,236 |
2016 | 187,263 |
Prior | 276,432 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,316,826 | 1,149,650
Real Estate Loan | Commercial | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 236,928 |
2019 | 220,454 |
2018 | 185,898 |
2017 | 189,533 |
2016 | 177,598 |
Prior | 255,195 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,265,606 | 1,103,543
Real Estate Loan | Commercial | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 1,910 |
2019 | 22 |
2018 | 10,785 |
2017 | 1,637 |
2016 | 5,141 |
Prior | 2,909 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 22,404 | 14,156
Real Estate Loan | Commercial | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 1,250 |
2019 | 70 |
2018 | 1,578 |
2017 | 3,066 |
2016 | 4,524 |
Prior | 18,328 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 28,816 | 31,951
1-4 Family | Real Estate Loan | Residential Properties |  |
Credit Quality Information [Abstract] |  |
2020 | 67,870 |
2019 | 34,880 |
2018 | 43,634 |
2017 | 31,240 |
2016 | 34,314 |
Prior | 95,281 |
Revolving Loans | 31,953 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 339,172 | 336,427
1-4 Family | Real Estate Loan | Residential Properties | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 67,380 |
2019 | 34,022 |
2018 | 41,203 |
2017 | 28,441 |
2016 | 31,987 |
Prior | 85,889 |
Revolving Loans | 30,391 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 319,313 | 314,999
1-4 Family | Real Estate Loan | Residential Properties | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 196 |
2019 | 158 |
2018 | 321 |
2017 | 953 |
2016 | 249 |
Prior | 1,176 |
Revolving Loans | 310 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 3,363 | 5,743
1-4 Family | Real Estate Loan | Residential Properties | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 294 |
2019 | 700 |
2018 | 2,110 |
2017 | 1,846 |
2016 | 2,078 |
Prior | 8,216 |
Revolving Loans | 1,252 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | $ 16,496 | $ 15,685

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