Parent Company Only Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends from:
Income tax benefit									$ (7,347)	$ (8,560)	$ (6,510)
Net Income	$ 7,899	$ 7,785	$ 8,246	$ 8,813	$ 10,484	$ 10,357	$ 9,767	$ 9,473	32,743	40,081	33,719
Dividends on preferred stock									(1,147)	0	0
Net earnings allocated to common stock									31,596	40,081	33,719
Comprehensive Income									40,878	51,016	30,066
Parent Company
Dividends from:
Bank subsidiary									16,702	12,696	12,029
Non-bank subsidiaries									10,350	0	3,000
Other									216	208	212
Total income									27,268	12,904	15,241
Expenses									(6,838)	(5,518)	(5,184)
Income before income taxes and equity in undistributed net income of subsidiaries									20,430	7,386	10,057
Change in net unrealized holdings gains (losses) on equity securities not held for trading									(31)	24	0
Income tax benefit									1,306	1,177	1,116
Equity in undistributed net income of bank subsidiary									18,197	27,580	24,031
Equity in undistributed (distributions in excess) of net income of non-bank subsidiaries									(7,159)	3,914	(1,485)
Net Income									32,743	40,081	33,719
Dividends on preferred stock									(1,147)	0	0
Net earnings allocated to common stock									31,596	40,081	33,719
Comprehensive Income									$ 32,519	$ 39,856	$ 33,687