Derivative and Hedging Activities Income Impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Interest Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ (1,779)	$ (448)
Interest Income [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(1,779)	5,871
Interest Income [Member] | Derivatives designated as hedging instruments(a)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss)	0	(6,319)
Other Operating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Other Operating Income (Expense) [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Other Operating Income (Expense) [Member] | Derivatives designated as hedging instruments(a)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss)	$ 0	$ 0