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Derivative Instruments - Fair Value Hedge Impact on Statement of Income (Details) - Interest Rate Swap - Designated as Hedging Instrument - Interest Expense - Fair Value Hedging - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments $ (209) $ 0 $ 0
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge $ 209 $ 0 $ 0