Business Combinations - Pro-Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Aug. 21, 2020	Mar. 13, 2020	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition, Pro Forma Information [Abstract]
Net interest income			$ 274,432	$ 266,033
Net income			$ 82,179	$ 100,718
EPS - basic (in dollars per share)			$ 1.60	$ 1.88
EPS - diluted (in dollars per share)			$ 1.59	$ 1.86
First Bank of The Palm Beaches
Business Acquisition, Pro Forma Information [Abstract]
Provision for credit losses excluded from pro-forma information		$ 1,800
Fourth Street Banking Company
Business Acquisition, Pro Forma Information [Abstract]
Provision for credit losses excluded from pro-forma information	$ 4,600