Acquisition - Schedule of Pro Forma Results (Details) - TCC - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Total revenues (net interest income plus noninterest income)	$ 71,983	$ 68,874
Net income	$ 23,100	$ 15,009
Diluted earnings per common share (in dollars per share)	$ 0.82	$ 0.55