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Mergers and Acquisitions - Pro Forma Combined Condensed Consolidated Financial Information (Details) - Brand Mortgage Group, LLC - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |
Net interest income - pro forma | $ 225,947 | $ 226,266
Noninterest income - pro forma | 77,845 | 86,995
Noninterest expense - pro forma | 182,122 | 219,184
Net income - pro forma | $ 91,735 | $ 65,181
Earnings per share - pro forma: |  |
Basic (usd per share) | $ 1.57 | $ 1.11
Diluted (usd per share) | $ 1.56 | $ 1.11

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