Derivatives and Hedging Derivatives and Hedging (Schedule of FHLBB advance interest rate swaps) (Details) - Forward-Starting Interest Rate Swap [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative, Notional Amount	$ 25,000
Contract Two [Member]
Derivative [Line Items]
Derivative, Inception Date	Feb. 25, 2015
Derivative, Maturity Date	Feb. 25, 2019
Derivative, Fixed Interest Rate	1.74%
Derivative, Notional Amount	$ 0	$ 25,000
Derivative, Fair Value, Net	$ 0	$ 30