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Loans Acquired - Summary of Acquired Loans, Excluding Loans Covered by Loss Share (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 13,002,952 | $ 11,723,171
Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,359,587 | 3,292,783
Risk Rate 1-4 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 12,761,764 | 11,523,787
Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,272,024 | 3,187,083
Risk Rate 5 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 95,017 | 80,394
Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 46,796 | 51,255
Risk Rate 6 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 146,039 | 118,407
Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 40,639 | 54,097
Risk Rate 7 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 132 | 583
Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 128 | 348
Risk Rate 8 |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer | Other consumer | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,431 | 15,658
Consumer | Other consumer | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,285 | 15,380
Consumer | Other consumer | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer | Other consumer | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 146 | 278
Consumer | Other consumer | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Consumer | Other consumer | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Real Estate | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 3,001,463 | 2,844,472
Real Estate | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,922,550 | 2,768,761
Real Estate | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 45,305 | 38,839
Real Estate | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 33,480 | 36,524
Real Estate | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 128 | 348
Real Estate | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Real Estate | Construction | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 362,000 | 429,605
Real Estate | Construction | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 344,075 | 393,122
Real Estate | Construction | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 17,874 | 27,621
Real Estate | Construction | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 51 | 8,862
Real Estate | Construction | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Real Estate | Construction | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Real Estate | Single family residential | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 504,490 | 566,188
Real Estate | Single family residential | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 492,826 | 553,460
Real Estate | Single family residential | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,224 | 2,081
Real Estate | Single family residential | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 10,312 | 10,299
Real Estate | Single family residential | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 128 | 348
Real Estate | Single family residential | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Real Estate | Other commercial | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,134,973 | 1,848,679
Real Estate | Other commercial | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 2,085,649 | 1,822,179
Real Estate | Other commercial | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 26,207 | 9,137
Real Estate | Other commercial | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 23,117 | 17,363
Real Estate | Other commercial | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Real Estate | Other commercial | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 350,693 | 432,653
Commercial | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 342,189 | 402,942
Commercial | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,491 | 12,416
Commercial | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 7,013 | 17,295
Commercial | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial | Commercial | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 349,821 | 430,914
Commercial | Commercial | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 341,385 | 401,300
Commercial | Commercial | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 1,491 | 12,416
Commercial | Commercial | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 6,945 | 17,198
Commercial | Commercial | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial | Commercial | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial | Agricultural | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 872 | 1,739
Commercial | Agricultural | Risk Rate 1-4 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 804 | 1,642
Commercial | Agricultural | Risk Rate 5 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial | Agricultural | Risk Rate 6 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 68 | 97
Commercial | Agricultural | Risk Rate 7 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | 0 | 0
Commercial | Agricultural | Risk Rate 8 | Loans acquired, net |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans | $ 0 | $ 0

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