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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 8,427,414 | $ 7,186,609
Loans 90 Days or More Past Due And Accruing | 69 | 1,855
Non-Accrual | 15,949 | 26,148
Total Past Due & Non-Accrual | 31,896 | 37,858
Total | 8,459,310 | 7,224,467
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 14,683 | 8,794
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,195 | 1,061
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,105,445 | 1,723,337
Loans 90 Days or More Past Due And Accruing | 4 | 249
Non-Accrual | 1,255 | 1,803
Total Past Due & Non-Accrual | 4,434 | 3,327
Total | 2,109,879 | 1,726,664
Commercial and industrial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 3,039 | 1,093
Commercial and industrial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 136 | 182
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 93,678 | 89,440
Loans 90 Days or More Past Due And Accruing | 0 | 0
Non-Accrual | 183 | 679
Total Past Due & Non-Accrual | 183 | 2,964
Total | 93,861 | 92,404
Agricultural production financing and other loans to farmers | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 2,285
Agricultural production financing and other loans to farmers | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 784,961 | 535,520
Loans 90 Days or More Past Due And Accruing | 0 | 1,478
Non-Accrual | 977 | 8,667
Total Past Due & Non-Accrual | 2,607 | 10,209
Total | 787,568 | 545,729
Construction | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,630 | 64
Construction | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 3,043,318 | 2,822,515
Loans 90 Days or More Past Due And Accruing | 0 | 0
Non-Accrual | 7,007 | 8,156
Total Past Due & Non-Accrual | 9,380 | 9,587
Total | 3,052,698 | 2,832,102
Commercial and farmland | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,324 | 1,253
Commercial and farmland | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 49 | 178
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,133,476 | 959,252
Loans 90 Days or More Past Due And Accruing | 22 | 17
Non-Accrual | 5,062 | 4,966
Total Past Due & Non-Accrual | 9,741 | 7,169
Total | 1,143,217 | 966,421
Residential | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,290 | 1,756
Residential | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 367 | 430
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 584,023 | 524,198
Loans 90 Days or More Past Due And Accruing | 42 | 107
Non-Accrual | 1,421 | 1,481
Total Past Due & Non-Accrual | 4,961 | 3,959
Total | 588,984 | 528,157
Home equity | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 2,960 | 2,164
Home equity | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 538 | 207
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 135,399 | 99,499
Loans 90 Days or More Past Due And Accruing | 1 | 4
Non-Accrual | 44 | 42
Total Past Due & Non-Accrual | 590 | 289
Total | 135,989 | 99,788
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 440 | 179
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 105 | 64
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 547,114 | 432,848
Loans 90 Days or More Past Due And Accruing | 0 | 0
Non-Accrual | 0 | 354
Total Past Due & Non-Accrual | 0 | 354
Total | 547,114 | 433,202
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

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