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Loans Acquired - Age Analysis of Past Due Acquired Loans, Excluding Loans Covered by Loss Share (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 Acquired |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 9,825 | 28,076
Current | 3,349,762 | 3,264,707
Total Loans | 3,359,587 | 3,292,783
90 Days Past Due & Accruing | 21 | 2
Loans Acquired | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,320 | 14,827
Loans Acquired | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,505 | 13,249
Loans Acquired | Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 167 | 386
Current | 7,264 | 15,272
Total Loans | 7,431 | 15,658
90 Days Past Due & Accruing | 4 | 2
Loans Acquired | Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 131 | 337
Loans Acquired | Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 36 | 49
Loans Acquired | Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 8,327 | 16,810
Current | 2,993,136 | 2,827,662
Total Loans | 3,001,463 | 2,844,472
90 Days Past Due & Accruing | 17 | 0
Loans Acquired | Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,582 | 13,157
Loans Acquired | Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,745 | 3,653
Loans Acquired | Real Estate | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 42 | 8,310
Current | 361,958 | 421,295
Total Loans | 362,000 | 429,605
90 Days Past Due & Accruing | 0 | 0
Loans Acquired | Real Estate | Construction | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 30 | 8,283
Loans Acquired | Real Estate | Construction | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 12 | 27
Loans Acquired | Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,454 | 7,755
Current | 499,036 | 558,433
Total Loans | 504,490 | 566,188
90 Days Past Due & Accruing | 17 | 0
Loans Acquired | Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,664 | 4,706
Loans Acquired | Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,790 | 3,049
Loans Acquired | Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,831 | 745
Current | 2,132,142 | 1,847,934
Total Loans | 2,134,973 | 1,848,679
90 Days Past Due & Accruing | 0 | 0
Loans Acquired | Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,888 | 168
Loans Acquired | Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 943 | 577
Loans Acquired | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,331 | 10,880
Current | 349,362 | 421,773
Total Loans | 350,693 | 432,653
90 Days Past Due & Accruing | 0 | 0
Loans Acquired | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 607 | 1,333
Loans Acquired | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 724 | 9,547
Loans Acquired | Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,331 | 10,844
Current | 348,490 | 420,070
Total Loans | 349,821 | 430,914
90 Days Past Due & Accruing | 0 | 0
Loans Acquired | Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 607 | 1,302
Loans Acquired | Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 724 | 9,542
Loans Acquired | Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 36
Current | 872 | 1,703
Total Loans | 872 | 1,739
90 Days Past Due & Accruing | 0 | 0
Loans Acquired | Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 31
Loans Acquired | Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 0 | $ 5

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