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	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative [Line Items]
Change in unrealized gain (loss) on fair value hedging instruments	$ (764)	$ 0	$ (4,941)	$ 0
Change in unrealized gain (loss) on hedged item in fair value hedge	$ 764	$ 0	$ 4,941	$ 0