Parent Company Only Financial Statements - Parent Company Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total interest income	$ 22,887	$ 23,625	$ 23,478	$ 23,310	$ 23,231	$ 22,197	$ 21,816	$ 20,458	$ 93,300	$ 87,702	$ 75,637
Expenses	4,428	4,944	5,187	4,190	3,978	3,268	2,916	2,316	18,749	12,478	7,967
Income before income taxes	9,783	9,436	11,217	8,460	7,953	9,321	7,166	8,598	38,896	33,038	32,515
Income tax benefit	(2,131)	(2,332)	(2,869)	(2,024)	(1,920)	(1,951)	(1,567)	(1,734)	(9,356)	(7,172)	(17,514)
Net income	$ 7,652	$ 7,104	$ 8,348	$ 6,436	$ 6,033	$ 7,370	$ 5,599	$ 6,864	29,540	25,866	15,001
Parent Company
Dividends from subsidiaries									15,000	11,470	7,845
Other income									15	14	16
Total interest income									15,015	11,484	7,861
Expenses									5,999	5,964	5,038
Income before equity in undistributed income									9,016	5,520	2,823
Equity in undistributed income of subsidiaries									19,089	18,852	10,755
Income before income taxes									28,105	24,372	13,578
Income tax benefit									1,435	1,494	1,423
Net income									$ 29,540	$ 25,866	$ 15,001