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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 9,170,399 | $ 8,432,491
Total Past Due | 72,775 | 26,819
Total | 9,243,174 | 8,459,310
Past due 90+ days and still accruing |  | 69
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 19,638 | 15,586
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 11,187 | 2,965
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 41,950 | 8,268
Past due 90+ days and still accruing | 746 |
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,761,473 | 2,105,757
Total Past Due | 15,226 | 4,122
Total | 2,776,699 | 2,109,879
Past due 90+ days and still accruing |  | 4
Commercial and industrial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 5,866 | 3,086
Commercial and industrial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 6,571 | 154
Commercial and industrial loans | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,789 | 882
Past due 90+ days and still accruing | 594 |
Agricultural land, production and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 280,615 | 333,012
Total Past Due | 1,269 | 1,160
Total | 281,884 | 334,172
Past due 90+ days and still accruing |  | 0
Agricultural land, production and other loans to farmers | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 146 | 46
Agricultural land, production and other loans to farmers | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 226 | 64
Agricultural land, production and other loans to farmers | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 897 | 1,050
Past due 90+ days and still accruing | 0 |
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 484,706 | 785,936
Total Past Due | 17 | 1,632
Total | 484,723 | 787,568
Past due 90+ days and still accruing |  | 0
Construction | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 1,632
Construction | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 17 | 0
Construction | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Past due 90+ days and still accruing | 0 |
Commercial real estate, non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,184,681 | 1,899,190
Total Past Due | 36,268 | 3,502
Total | 2,220,949 | 1,902,692
Past due 90+ days and still accruing |  | 0
Commercial real estate, non-owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,525 | 1,348
Commercial real estate, non-owner occupied | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,109 | 544
Commercial real estate, non-owner occupied | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 31,634 | 1,610
Past due 90+ days and still accruing | 0 |
Commercial real estate, owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 951,561 | 906,881
Total Past Due | 6,940 | 2,814
Total | 958,501 | 909,695
Past due 90+ days and still accruing |  | 0
Commercial real estate, owner occupied | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,854 | 976
Commercial real estate, owner occupied | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 180 | 208
Commercial real estate, owner occupied | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,906 | 1,630
Past due 90+ days and still accruing | 0 |
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,226,779 | 1,134,650
Total Past Due | 7,962 | 8,567
Total | 1,234,741 | 1,143,217
Past due 90+ days and still accruing |  | 22
Residential | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3,269 | 4,976
Residential | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,429 | 1,279
Residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3,264 | 2,312
Past due 90+ days and still accruing | 133 |
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 503,596 | 584,506
Total Past Due | 4,663 | 4,478
Total | 508,259 | 588,984
Past due 90+ days and still accruing |  | 42
Home equity | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,644 | 3,083
Home equity | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 559 | 611
Home equity | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,460 | 784
Past due 90+ days and still accruing | 19 |
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 129,049 | 135,445
Total Past Due | 430 | 544
Total | 129,479 | 135,989
Past due 90+ days and still accruing |  | 1
Construction | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 334 | 439
Construction | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 96 | 105
Construction | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Past due 90+ days and still accruing | 0 |
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 647,939 | 547,114
Total Past Due | 0 | 0
Total | 647,939 | 547,114
Past due 90+ days and still accruing |  | 0
Public finance and other commercial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Public finance and other commercial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Public finance and other commercial loans | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | $ 0
Past due 90+ days and still accruing | $ 0 |

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