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Acquisitions - Acquisitions Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended |
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Jul. 14, 2017 USD ($) bank_branch shares | May 19, 2017 USD ($) bank_branch shares | Nov. 21, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Oct. 09, 2018 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 45.71
Issuance of common stock related to acquisition |  |  |  |  |  | $ 321,431 |  |
Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Stock issued as a part of acquisition (in shares) | shares |  |  |  |  |  | 8,044,446 |  |
Issuance of common stock related to acquisition |  |  |  |  |  | $ 1,006 |  |
IAB |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Shares purchased (in shares) | shares |  |  | 495,112 |  |  |  |  |
Percentage of interest acquired |  |  | 12.10% | 1210.00% |  |  |  |
Value of acquired shares |  |  | $ 19,800 |  |  |  |  |
Purchase price per share (in dollars per share) | $ / shares |  |  | $ 40.00 |  |  |  |  |
Number of banking centers acquired | bank_branch | 16 |  |  |  |  |  |  |
Stock issued as a part of acquisition (in shares) | shares | 6,000,000 |  |  |  |  |  |  |
Issuance of common stock related to acquisition | $ 238,800 |  |  |  |  |  |  |
Total purchase price | 258,600 |  |  |  |  |  |  |
Fair value of equity interest after adjustment |  |  |  | $ 19,800 |  |  |  |
Remeasurement loss |  |  |  |  |  | 50 |  |
Other intangible assets | 17,403 |  |  |  |  |  |  |
Operating revenue |  |  |  |  |  | 21,400 |  |
IAB | Core deposits |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other intangible assets | $ 13,638 |  |  |  |  |  |  |
Acquired intangible asset, expected useful life | 10 years |  |  |  |  |  |  |
IAB | Noncompete agreements |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other intangible assets | $ 3,765 |  |  |  |  |  |  |
Acquired intangible asset, expected useful life | 2 years |  |  |  |  |  |  |
IAB | Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of shares of common stock | 1.653 |  |  |  |  |  |  |
Arlington Bank |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 100.00% |  |  |  |  |  |
Number of banking centers acquired | bank_branch |  | 3 |  |  |  |  |  |
Stock issued as a part of acquisition (in shares) | shares |  | 2,100,000 |  |  |  |  |  |
Issuance of common stock related to acquisition |  | $ 82,600 |  |  |  |  |  |
Other intangible assets |  | 4,526 |  |  |  |  |  |
Operating revenue |  |  |  |  |  | 9,000 |  |
Arlington Bank | Core deposits |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Other intangible assets |  | $ 4,526 |  |  |  |  |  |
Acquired intangible asset, expected useful life |  | 10 years |  |  |  |  |  |
Arlington Bank | Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of shares of common stock |  | 2.7245 |  |  |  |  |  |
Arlington Bank and IAB | Expenses directly attributable to acquisitions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Non-recurring expenses |  |  |  |  |  | $ 15,400 |  |

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