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Loans and Allowance - Past Due Aging of Loan Portfolio by Loan Class (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Current | $ 7,470,923 | $ 7,186,609
Non-Accrual | 25,635 | 26,148
Total Past Due & Non-Accrual | 40,447 | 37,858
Total | 7,511,370 | 7,224,467
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 1,874,004 | 1,723,337
Non-Accrual | 2,770 | 1,803
Total Past Due & Non-Accrual | 3,038 | 3,327
Total | 1,877,042 | 1,726,664
Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 80,634 | 89,440
Non-Accrual | 2,785 | 679
Total Past Due & Non-Accrual | 2,818 | 2,964
Total | 83,452 | 92,404
Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 617,519 | 535,520
Non-Accrual | 6,918 | 8,667
Total Past Due & Non-Accrual | 7,029 | 10,209
Total | 624,548 | 545,729
Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 2,808,422 | 2,822,515
Non-Accrual | 6,340 | 8,156
Total Past Due & Non-Accrual | 13,267 | 9,587
Total | 2,821,689 | 2,832,102
Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 984,086 | 959,252
Non-Accrual | 4,579 | 4,966
Total Past Due & Non-Accrual | 9,716 | 7,169
Total | 993,802 | 966,421
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 544,338 | 524,198
Non-Accrual | 1,826 | 1,481
Total Past Due & Non-Accrual | 3,668 | 3,959
Total | 548,006 | 528,157
Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 97,826 | 99,499
Non-Accrual | 64 | 42
Total Past Due & Non-Accrual | 558 | 289
Total | 98,384 | 99,788
Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Current | 464,094 | 432,848
Non-Accrual | 353 | 354
Total Past Due & Non-Accrual | 353 | 354
Total | 464,447 | 433,202
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 13,398 | 8,794
30-59 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 248 | 1,093
30-59 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 33 | 2,285
30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 111 | 64
30-59 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 6,751 | 1,253
30-59 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 4,540 | 1,756
30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,308 | 2,164
30-59 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 407 | 179
30-59 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 1,205 | 1,061
60-89 Days Past Due | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 20 | 182
60-89 Days Past Due | Agricultural production financing and other loans to farmers |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
60-89 Days Past Due | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 176 | 178
60-89 Days Past Due | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 422 | 430
60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 500 | 207
60-89 Days Past Due | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 87 | 64
60-89 Days Past Due | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 209 | 1,855
Loans 90 Days or More Past Due And Accruing | Commercial and industrial loans |  |
Financing Receivable, 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, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 1,478
Loans 90 Days or More Past Due And Accruing | Commercial and farmland |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 0
Loans 90 Days or More Past Due And Accruing | Residential |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 175 | 17
Loans 90 Days or More Past Due And Accruing | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 34 | 107
Loans 90 Days or More Past Due And Accruing | Individuals' loans for household and other personal expenditures |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | 0 | 4
Loans 90 Days or More Past Due And Accruing | Public finance and other commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Past Due | $ 0 | $ 0

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