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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Loans | $ 13,002,952 | $ 11,723,171
Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 54,422 | 36,687
Current | 9,588,943 | 8,393,701
Total Loans | 9,643,365 | 8,430,388
90 Days Past Due & Accruing | 155 | 224
Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 31,346 | 21,917
90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 23,076 | 14,770
Consumer | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,685 | 6,699
Current | 398,041 | 398,771
Total Loans | 403,726 | 405,470
90 Days Past Due & Accruing | 144 | 213
Consumer | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,341 | 5,297
Consumer | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,344 | 1,402
Consumer | Credit cards | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,608 | 1,539
Current | 193,475 | 202,634
Total Loans | 195,083 | 204,173
90 Days Past Due & Accruing | 130 | 209
Consumer | Credit cards | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 958 | 1,033
Consumer | Credit cards | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 650 | 506
Consumer | Other consumer | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,077 | 5,160
Current | 204,566 | 196,137
Total Loans | 208,643 | 201,297
90 Days Past Due & Accruing | 14 | 4
Consumer | Other consumer | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,383 | 4,264
Consumer | Other consumer | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 694 | 896
Real Estate | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 32,114 | 18,889
Current | 6,759,907 | 5,947,564
Total Loans | 6,792,021 | 5,966,453
90 Days Past Due & Accruing | 0 | 0
Real Estate | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 21,721 | 11,681
Real Estate | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 10,393 | 7,208
Real Estate | Construction | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,303 | 841
Current | 1,708,555 | 1,299,882
Total Loans | 1,712,858 | 1,300,723
90 Days Past Due & Accruing | 0 | 0
Real Estate | Construction | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,690 | 533
Real Estate | Construction | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 613 | 308
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 16,417 | 11,896
Current | 1,432,038 | 1,428,547
Total Loans | 1,448,455 | 1,440,443
90 Days Past Due & Accruing | 0 | 0
Real Estate | Single family residential | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 10,022 | 7,769
Real Estate | Single family residential | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,395 | 4,127
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,394 | 6,152
Current | 3,619,314 | 3,219,135
Total Loans | 3,630,708 | 3,225,287
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 8,009 | 3,379
Real Estate | Other commercial | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,385 | 2,773
Commercial | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 16,623 | 11,099
Current | 2,091,949 | 1,928,324
Total Loans | 2,108,572 | 1,939,423
90 Days Past Due & Accruing | 11 | 11
Commercial | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,284 | 4,939
Commercial | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,339 | 6,160
Commercial | Commercial | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 15,989 | 9,577
Current | 1,878,830 | 1,765,332
Total Loans | 1,894,819 | 1,774,909
90 Days Past Due & Accruing | 11 | 11
Commercial | Commercial | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,999 | 4,472
Commercial | Commercial | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 10,990 | 5,105
Commercial | Agricultural | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 634 | 1,522
Current | 213,119 | 162,992
Total Loans | 213,753 | 164,514
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 285 | 467
Commercial | Agricultural | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 349 | 1,055
Other | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 339,046 | 119,042
Total Loans | 339,046 | 119,042
90 Days Past Due & Accruing | 0 | $ 0
Other | Gross 30-89 Days Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 |
Other | 90 Days or More Past Due | Loans, Excluding Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 0 |

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