Investment Securities - Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment Securities
Less than 12 months Fair Value	$ 18,766	$ 18,186
Less than 12 months Unrealized Loss	(97)	(340)
12 months or more Fair Value	19,112	50,327
12 months or more Unrealized Loss	(247)	(1,741)
Total Fair Value	37,878	68,513
Total Unrealized Loss	(344)	(2,081)
Collateralized mortgage obligations
Investment Securities
Less than 12 months Fair Value	11,792	1,625
Less than 12 months Unrealized Loss	(65)	(22)
12 months or more Fair Value	7,330	17,546
12 months or more Unrealized Loss	(122)	(640)
Total Fair Value	19,122	19,171
Total Unrealized Loss	(187)	(662)
Agency mortgage-backed securities
Investment Securities
Less than 12 months Fair Value	4,577	3,399
Less than 12 months Unrealized Loss	(20)	(74)
12 months or more Fair Value	10,918	21,417
12 months or more Unrealized Loss	(115)	(840)
Total Fair Value	15,495	24,816
Total Unrealized Loss	(135)	(914)
Municipal securities
Investment Securities
Less than 12 months Fair Value	1,806	13,162
Less than 12 months Unrealized Loss	(7)	(244)
12 months or more Fair Value	864	8,415
12 months or more Unrealized Loss	(10)	(210)
Total Fair Value	2,670	21,577
Total Unrealized Loss	(17)	(454)
U.S. Government agency securities
Investment Securities
Less than 12 months Fair Value	591
Less than 12 months Unrealized Loss	(5)
12 months or more Fair Value		1,959
12 months or more Unrealized Loss		(40)
Total Fair Value	591	1,959
Total Unrealized Loss	$ (5)	(40)
U.S. Treasury securities
Investment Securities
12 months or more Fair Value		990
12 months or more Unrealized Loss		(11)
Total Fair Value		990
Total Unrealized Loss		$ (11)