Securities - Securities with Unrealized Losses - Securities Held-to-maturity (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Held-to-maturity, Fair Value
Less Than 12 Months	$ 245,000	$ 51,616,000
12 Months or More		88,128,000
Total	245,000	139,744,000
Held-to-maturity, Unrealized (Losses)
Less Than 12 Months	(1,000)	(182,000)
12 Months or More		(790,000)
Total	(1,000)	(972,000)
Agency mortgage-backed securities
Held-to-maturity, Fair Value
Less Than 12 Months	245,000	50,060,000
12 Months or More		88,128,000
Total	245,000	138,188,000
Held-to-maturity, Unrealized (Losses)
Less Than 12 Months	(1,000)	(178,000)
12 Months or More		(790,000)
Total	$ (1,000)	(968,000)
Municipals - exempt from Federal tax
Held-to-maturity, Fair Value
Less Than 12 Months		1,556,000
Total		1,556,000
Held-to-maturity, Unrealized (Losses)
Less Than 12 Months		(4,000)
Total		$ (4,000)