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Derivatives, Hedging Activities, and Other Financial Instruments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative [Line Items]          
Collateral already posted, fair value $ 26,500   $ 26,500   $ 46,500
Derivative liability 27,600   27,600   45,400
Not Designated as Hedging Instrument          
Derivative [Line Items]          
Derivative, notional amount 925,400   925,400   $ 725,900
Interest Rate Swap          
Derivative [Line Items]          
Gain (loss) in fair value adjustments $ 14 $ 15 $ 55 $ 364