Commitments and Contingencies Commitments and Contingencies - Hedged Assets Related to Interest Rate Derivatives (Details) - Derivatives designated as hedging instruments - Interest rate swaps - Fair value hedge - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Carrying Amount of the Hedged Asset	$ 7,510	$ 7,882
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Asset	$ 229	$ 346