Acquisitions - Supplemental Pro Forma Financial Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Combinations [Abstract]
Net interest income	$ 48,753	$ 46,787
Provision for loan losses	508	1,382
Noninterest income	5,694	6,198
Noninterest expense	31,205	30,501
Net income	$ 17,784	$ 16,687
Fully diluted (in dollars per share)	$ 0.35	$ 0.33