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Loans and Allowance for Credit Losses - Credit Risk Profile of Loan Portfolio on Amortized Cost Basis Based on Risk Rating Category (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Credit Quality Information [Abstract] |  |
2020 | $ 1,085,080 |
2019 | 558,953 |
2018 | 386,847 |
2017 | 300,829 |
2016 | 247,242 |
Prior | 517,313 |
Revolving Loans | 42,155 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 3,138,419 | $ 2,695,347
Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 1,052,257 |
2019 | 511,427 |
2018 | 367,652 |
2017 | 279,274 |
2016 | 230,730 |
Prior | 459,453 |
Revolving Loans | 40,363 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 2,941,156 | 2,558,157
Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 29,692 |
2019 | 44,049 |
2018 | 8,731 |
2017 | 15,165 |
2016 | 9,344 |
Prior | 30,525 |
Revolving Loans | 293 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 137,799 | 71,611
Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 3,131 |
2019 | 3,477 |
2018 | 10,464 |
2017 | 6,390 |
2016 | 7,168 |
Prior | 27,335 |
Revolving Loans | 1,499 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 59,464 | 65,579
Agricultural Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 104,515 |
2019 | 20,401 |
2018 | 6,697 |
2017 | 2,062 |
2016 | 783 |
Prior | 2,894 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 137,352 | 136,124
Agricultural Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 83,377 |
2019 | 15,680 |
2018 | 5,978 |
2017 | 1,838 |
2016 | 635 |
Prior | 2,856 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 110,364 | 129,811
Agricultural Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 21,070 |
2019 | 4,483 |
2018 | 694 |
2017 | 224 |
2016 | 148 |
Prior | 38 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 26,657 | 3,862
Agricultural Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 68 |
2019 | 238 |
2018 | 25 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 331 | 2,451
Commercial and Industrial Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 376,688 |
2019 | 166,638 |
2018 | 71,878 |
2017 | 81,068 |
2016 | 43,676 |
Prior | 116,603 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 856,551 | 655,580
Commercial and Industrial Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 371,683 |
2019 | 132,148 |
2018 | 70,497 |
2017 | 78,890 |
2016 | 42,439 |
Prior | 114,904 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 810,561 | 603,047
Commercial and Industrial Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 4,116 |
2019 | 32,130 |
2018 | 849 |
2017 | 489 |
2016 | 1,101 |
Prior | 730 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 39,415 | 40,395
Commercial and Industrial Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 889 |
2019 | 2,360 |
2018 | 532 |
2017 | 1,689 |
2016 | 136 |
Prior | 969 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 6,575 | 12,138
Consumer Loans |  |
Credit Quality Information [Abstract] |  |
2020 | 31,624 |
2019 | 21,424 |
2018 | 12,219 |
2017 | 8,375 |
2016 | 3,218 |
Prior | 1,142 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 78,002 | 83,183
Consumer Loans | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 31,609 |
2019 | 21,384 |
2018 | 12,084 |
2017 | 8,279 |
2016 | 3,150 |
Prior | 1,022 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 77,528 | 82,117
Consumer Loans | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 24 |
2018 | 24 |
2017 | 1 |
2016 | 1 |
Prior | 0 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 50 | 140
Consumer Loans | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 15 |
2019 | 16 |
2018 | 111 |
2017 | 95 |
2016 | 67 |
Prior | 120 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 424 | 926
Real Estate Loan |  |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 2,066,514 | 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 | 41,842 |
2019 | 41,117 |
2018 | 31,500 |
2017 | 3,277 |
2016 | 871 |
Prior | 3,872 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 122,479 | 94,142
Real Estate Loan | Construction and Land Development | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 41,842 |
2019 | 40,989 |
2018 | 31,500 |
2017 | 2,760 |
2016 | 871 |
Prior | 3,822 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 121,784 | 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 | 128 |
2018 | 0 |
2017 | 517 |
2016 | 0 |
Prior | 50 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 695 | 316
Real Estate Loan | Agricultural |  |
Credit Quality Information [Abstract] |  |
2020 | 75,475 |
2019 | 38,382 |
2018 | 39,172 |
2017 | 16,815 |
2016 | 14,729 |
Prior | 69,768 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 254,341 | 240,241
Real Estate Loan | Agricultural | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 73,630 |
2019 | 34,412 |
2018 | 37,839 |
2017 | 16,138 |
2016 | 13,559 |
Prior | 58,291 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 233,869 | 231,227
Real Estate Loan | Agricultural | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 1,845 |
2019 | 3,970 |
2018 | 533 |
2017 | 469 |
2016 | 1,106 |
Prior | 11,232 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 19,155 | 6,902
Real Estate Loan | Agricultural | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 0 |
2019 | 0 |
2018 | 800 |
2017 | 208 |
2016 | 64 |
Prior | 245 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,317 | 2,112
Real Estate Loan | Commercial |  |
Credit Quality Information [Abstract] |  |
2020 | 373,082 |
2019 | 238,459 |
2018 | 184,780 |
2017 | 161,567 |
2016 | 155,046 |
Prior | 250,998 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,363,932 | 1,149,650
Real Estate Loan | Commercial | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 368,750 |
2019 | 237,119 |
2018 | 171,591 |
2017 | 148,283 |
2016 | 143,400 |
Prior | 215,616 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 1,284,759 | 1,103,543
Real Estate Loan | Commercial | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 2,469 |
2019 | 1,300 |
2018 | 6,108 |
2017 | 11,262 |
2016 | 6,741 |
Prior | 16,947 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 44,827 | 14,156
Real Estate Loan | Commercial | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 1,863 |
2019 | 40 |
2018 | 7,081 |
2017 | 2,022 |
2016 | 4,905 |
Prior | 18,435 |
Revolving Loans | 0 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 34,346 | 31,951
1-4 Family | Real Estate Loan | Residential Properties |  |
Credit Quality Information [Abstract] |  |
2020 | 81,854 |
2019 | 32,532 |
2018 | 40,601 |
2017 | 27,665 |
2016 | 28,919 |
Prior | 72,036 |
Revolving Loans | 42,155 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 325,762 | 336,427
1-4 Family | Real Estate Loan | Residential Properties | Pass |  |
Credit Quality Information [Abstract] |  |
2020 | 81,366 |
2019 | 29,695 |
2018 | 38,163 |
2017 | 23,086 |
2016 | 26,676 |
Prior | 62,942 |
Revolving Loans | 40,363 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 302,291 | 314,999
1-4 Family | Real Estate Loan | Residential Properties | Special Mention |  |
Credit Quality Information [Abstract] |  |
2020 | 192 |
2019 | 2,142 |
2018 | 523 |
2017 | 2,720 |
2016 | 247 |
Prior | 1,578 |
Revolving Loans | 293 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | 7,695 | 5,743
1-4 Family | Real Estate Loan | Residential Properties | Substandard |  |
Credit Quality Information [Abstract] |  |
2020 | 296 |
2019 | 695 |
2018 | 1,915 |
2017 | 1,859 |
2016 | 1,996 |
Prior | 7,516 |
Revolving Loans | 1,499 |
Loans Receivable Aging Analysis [Abstract] |  |
Total Loans Receivable | $ 15,776 | $ 15,685

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