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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 | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |
Net interest income - pro forma | $ 334,772 | $ 341,946
Noninterest income - pro forma | 115,798 | 117,476
Noninterest expense - pro forma | 278,622 | 359,386
Net income - pro forma | $ 129,181 | $ 72,719
Earnings per share - pro forma: |  |
Basic (usd per share) | $ 2.21 | $ 1.24
Diluted (usd per share) | $ 2.21 | $ 1.24

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