Investment Securities - Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Investment Securities
Less than 12 months Fair Value	$ 13,942	$ 18,766
Less than 12 months Unrealized Loss	(166)	(97)
12 months or more Fair Value	2,514	19,112
12 months or more Unrealized Loss	(84)	(247)
Total Fair Value	16,456	37,878
Total Unrealized Loss	$ (250)	$ (344)
Number of securities continuous unrealized loss position more than twelve months | security	39	97
Collateralized mortgage obligations
Investment Securities
Less than 12 months Fair Value	$ 10,036	$ 11,792
Less than 12 months Unrealized Loss	(130)	(65)
12 months or more Fair Value	1,335	7,330
12 months or more Unrealized Loss	(67)	(122)
Total Fair Value	11,371	19,122
Total Unrealized Loss	(197)	(187)
Agency mortgage-backed securities
Investment Securities
Less than 12 months Fair Value	829	4,577
Less than 12 months Unrealized Loss	(13)	(20)
12 months or more Fair Value	635	10,918
12 months or more Unrealized Loss	(10)	(115)
Total Fair Value	1,464	15,495
Total Unrealized Loss	(23)	(135)
Municipal securities
Investment Securities
Less than 12 months Fair Value	2,502	1,806
Less than 12 months Unrealized Loss	(19)	(7)
12 months or more Fair Value	544	864
12 months or more Unrealized Loss	(7)	(10)
Total Fair Value	3,046	2,670
Total Unrealized Loss	(26)	(17)
U.S. Government agency securities
Investment Securities
Less than 12 months Fair Value	575	591
Less than 12 months Unrealized Loss	(4)	(5)
Total Fair Value	575	591
Total Unrealized Loss	$ (4)	$ (5)