Investment Securities (Schedule of unrealized loss position of held to maturity investment securities) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Held-to-maturity, Unrealized Loss:
Other-than-tempory realized losses	$ 0	$ 0
Mortgage-Backed Securities
Held-to-maturity, Fair Value:
12 Months or Longer, Fair Value	94,000	103,000
Total, Fair Value	94,000	103,000
Held-to-maturity, Unrealized Loss:
12 Months or Longer, Unrealized Loss	1,000	3,000
Total, Unrealized Loss	$ 1,000	$ 3,000