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Derivative Instruments and Hedge Activities - Summary of Cash Flow Hedges (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]    
Notional Amount $ 866,486 $ 391,847
Gross amounts recognized 13,463 17,149
Derivative liabilities fair value 12,348 $ 18,133
Cash Flow Hedges    
Derivative [Line Items]    
Notional Amount 400,000  
Gross amounts recognized 1,799  
Derivative liabilities fair value $ 192  
Weighted average pay rates 0.98%  
Weighted average maturity 5 years 2 months 12 days