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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
	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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