Investment Securities - Gross unrealized losses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair Value
Less Than 12 Months	$ 655,000	$ 2,139,000
12 Months or More	3,682,000	3,022,000
Total fair value	4,337,000	5,161,000
Unrealized (Losses)
Less Than 12 Months	(4,000)	(13,000)
12 Months or More	(23,000)	(117,000)
Total unrealized (losses)	(27,000)	(130,000)
Declines deemed to be other-than-temporary	0	0
SBA 7a Pools
Fair Value
Less Than 12 Months		1,909,000
12 Months or More	1,692,000
Total fair value	1,692,000	1,909,000
Unrealized (Losses)
Less Than 12 Months		(11,000)
12 Months or More	(8,000)
Total unrealized (losses)	(8,000)	(11,000)
FHLMC | Mortgage-Backed Securities
Fair Value
Less Than 12 Months	655,000
12 Months or More	1,990,000	3,022,000
Total fair value	2,645,000	3,022,000
Unrealized (Losses)
Less Than 12 Months	(4,000)
12 Months or More	(15,000)	(117,000)
Total unrealized (losses)	$ (19,000)	(117,000)
FNMA | Mortgage-Backed Securities
Fair Value
Less Than 12 Months		230,000
Total fair value		230,000
Unrealized (Losses)
Less Than 12 Months		(2,000)
Total unrealized (losses)		$ (2,000)