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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 7,248,608 | $ 7,186,609
Non-Accrual | 27,949 | 26,148
Total Past Due & Non-Accrual | 50,712 | 37,858
Total | 7,299,320 | 7,224,467
Commercial and industrial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,784,771 | 1,723,337
Non-Accrual | 2,498 | 1,803
Total Past Due & Non-Accrual | 3,857 | 3,327
Total | 1,788,628 | 1,726,664
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 77,435 | 89,440
Non-Accrual | 2,910 | 679
Total Past Due & Non-Accrual | 2,922 | 2,964
Total | 80,357 | 92,404
Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 534,904 | 535,520
Non-Accrual | 7,533 | 8,667
Total Past Due & Non-Accrual | 7,597 | 10,209
Total | 542,501 | 545,729
Commercial and farmland |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,818,380 | 2,822,515
Non-Accrual | 8,201 | 8,156
Total Past Due & Non-Accrual | 20,418 | 9,587
Total | 2,838,798 | 2,832,102
Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 965,990 | 959,252
Non-Accrual | 4,473 | 4,966
Total Past Due & Non-Accrual | 10,678 | 7,169
Total | 976,668 | 966,421
Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 531,874 | 524,198
Non-Accrual | 1,963 | 1,481
Total Past Due & Non-Accrual | 4,334 | 3,959
Total | 536,208 | 528,157
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 107,792 | 99,499
Non-Accrual | 18 | 42
Total Past Due & Non-Accrual | 424 | 289
Total | 108,216 | 99,788
Public finance and other commercial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 427,462 | 432,848
Non-Accrual | 353 | 354
Total Past Due & Non-Accrual | 482 | 354
Total | 427,944 | 433,202
30-59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 20,913 | 8,794
30-59 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 977 | 1,093
30-59 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 12 | 2,285
30-59 Days Past Due | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 64 | 64
30-59 Days Past Due | Commercial and farmland |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 12,095 | 1,253
30-59 Days Past Due | Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 5,666 | 1,756
30-59 Days Past Due | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,646 | 2,164
30-59 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 324 | 179
30-59 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 129 | 0
60-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 1,716 | 1,061
60-89 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 382 | 182
60-89 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due | Commercial and farmland |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 178
60-89 Days Past Due | Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 539 | 430
60-89 Days Past Due | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 725 | 207
60-89 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 70 | 64
60-89 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 134 | 1,855
Loans 90 Days or More Past Due And Accruing | Commercial and industrial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 249
Loans 90 Days or More Past Due And Accruing | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 1,478
Loans 90 Days or More Past Due And Accruing | Commercial and farmland |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 122 | 0
Loans 90 Days or More Past Due And Accruing | Residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 17
Loans 90 Days or More Past Due And Accruing | Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 0 | 107
Loans 90 Days or More Past Due And Accruing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | 12 | 4
Loans 90 Days or More Past Due And Accruing | Public finance and other commercial loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past Due | $ 0 | $ 0

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