Business Combinations - Pro-Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Combinations [Abstract]
Net interest income1	$ 67,272	$ 61,879	$ 131,887	$ 124,417
Net income	$ 25,080	$ 23,966	$ 27,526	$ 45,378
EPS - basic (in dollars per share)	$ 0.47	$ 0.46	$ 0.52	$ 0.87
EPS - diluted (in dollars per share)	$ 0.47	$ 0.45	$ 0.52	$ 0.86