Securities - Securities with Unrealized Losses - Securities Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Held-to-maturity, Fair Value
Less Than 12 Months		$ 51,616
12 Months or More	$ 1,183	88,128
Total	1,183	139,744
Held-to-maturity, Unrealized (Losses)
Less Than 12 Months		(182)
12 Months or More	(1)	(790)
Total	(1)	(972)
Agency mortgage-backed securities
Held-to-maturity, Fair Value
Less Than 12 Months		50,060
12 Months or More	1,183	88,128
Total	1,183	138,188
Held-to-maturity, Unrealized (Losses)
Less Than 12 Months		(178)
12 Months or More	(1)	(790)
Total	$ (1)	(968)
Municipals - exempt from Federal tax
Held-to-maturity, Fair Value
Less Than 12 Months		1,556
Total		1,556
Held-to-maturity, Unrealized (Losses)
Less Than 12 Months		(4)
Total		$ (4)