Derivative Financial Instruments - Schedule of Cumulative Basis Adjustments for Fair Value Hedges (Details) $ in Thousands	Dec. 31, 2020 USD ($)	[1]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Carrying Amount of the Hedged Assets	$ 42,714
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets	$ (837)

[1] These amounts include the amortized cost basis of closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. As of December 31, 2020, the amortized cost basis of the closed portfolios used in these hedging relationships was $41.9 million, the cumulative basis adjustments associated with these hedging relationships was $0.8 million, and the amounts of the designated hedged items were $20 million.