Acquisitions - Supplemental Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Business Combinations [Abstract]
Net interest income	$ 97,951	$ 94,903
Provision for loan losses	508	3,095
Noninterest income	12,083	12,732
Noninterest expense	62,573	61,324
Net income	$ 35,511	$ 33,987
Fully diluted (in dollars per share)	$ 0.70	$ 0.67