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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 7,186,609 | $ 6,703,256
Loans 90 Days or More Past Due And Accruing | 1,855 | 924
Non-Accrual | 26,148 | 28,724
Total Past Due & Non-Accrual | 37,858 | 47,943
Total | 7,224,467 | 6,751,199
30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 8,794 | 16,773
60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,061 | 1,522
Commercial and industrial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,723,337 | 1,487,221
Loans 90 Days or More Past Due And Accruing | 249 |
Non-Accrual | 1,803 | 3,275
Total Past Due & Non-Accrual | 3,327 | 6,272
Total | 1,726,664 | 1,493,493
Commercial and industrial loans | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,093 | 2,967
Commercial and industrial loans | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 182 | 30
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 89,440 | 120,720
Loans 90 Days or More Past Due And Accruing |  |
Non-Accrual | 679 | 1,027
Total Past Due & Non-Accrual | 2,964 | 1,037
Total | 92,404 | 121,757
Agricultural production financing and other loans to farmers | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,285 | 10
Agricultural production financing and other loans to farmers | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  |
Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 535,520 | 610,896
Loans 90 Days or More Past Due And Accruing | 1,478 | 65
Non-Accrual | 8,667 | 65
Total Past Due & Non-Accrual | 10,209 | 1,323
Total | 545,729 | 612,219
Construction | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 64 | 1,193
Construction | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  |
Commercial and farmland |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,822,515 | 2,542,048
Loans 90 Days or More Past Due And Accruing |  | 603
Non-Accrual | 8,156 | 12,951
Total Past Due & Non-Accrual | 9,587 | 20,643
Total | 2,832,102 | 2,562,691
Commercial and farmland | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,253 | 6,923
Commercial and farmland | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 178 | 166
Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 959,252 | 948,947
Loans 90 Days or More Past Due And Accruing | 17 | 56
Non-Accrual | 4,966 | 9,444
Total Past Due & Non-Accrual | 7,169 | 13,818
Total | 966,421 | 962,765
Residential | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,756 | 4,010
Residential | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 430 | 308
Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 524,198 | 510,362
Loans 90 Days or More Past Due And Accruing | 107 | 175
Non-Accrual | 1,481 | 1,928
Total Past Due & Non-Accrual | 3,959 | 3,659
Total | 528,157 | 514,021
Home equity | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 2,164 | 1,372
Home equity | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 207 | 184
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 99,499 | 85,744
Loans 90 Days or More Past Due And Accruing | 4 | 25
Non-Accrual | 42 | 34
Total Past Due & Non-Accrual | 289 | 1,191
Total | 99,788 | 86,935
Consumer | 30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 179 | 298
Consumer | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 64 | 834
Lease financing receivables, net of unearned income |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,600 | 2,527
Non-Accrual |  |
Total Past Due & Non-Accrual |  |
Total | 1,600 | 2,527
Other commercial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 431,248 | 394,791
Non-Accrual | 354 |
Total Past Due & Non-Accrual | 354 |
Total | 431,602 | 394,791
Other commercial loans | 60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due |  |

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