Parent Company Financial Information - Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Balance Sheets [Abstract]
Equity securities, at fair value	$ 0	$ 1,830
Securities available for sale, at fair value	379,195	332,653
Total assets	2,478,550	1,862,866	$ 1,816,078
Subordinated debt	7,517	0
Junior subordinated debt	28,029	27,927
Shareholders' equity	320,258	222,542	$ 208,717	$ 201,380
Total liabilities and shareholders' equity	2,478,550	1,862,866
Parent Company
Consolidated Balance Sheets [Abstract]
Cash	11,127	3,596
Equity securities, at fair value	0	1,830
Securities available for sale, at fair value	8,683	6,361
Investment in subsidiaries	337,983	239,413
Due from subsidiaries	134	170
Other assets	674	64
Total assets	358,601	251,434
Subordinated debt	7,517	0
Junior subordinated debt	28,029	27,927
Other liabilities	2,797	965
Shareholders' equity	320,258	222,542
Total liabilities and shareholders' equity	$ 358,601	$ 251,434