Business Combinations - Supplemental Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Business Combination and Asset Acquisition [Abstract]
Net interest income	$ 137,097	$ 119,062
Net income	$ 34,628	$ 42,343
Basic earnings per common share (in USD per share)	$ 2.01	$ 2.54
Diluted earnings per common share (in USD per share)	$ 2.01	$ 2.54