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Derivative Instruments and Hedge Activities - Summary of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Derivatives Fair Value [Line Items]    
Notional Amount $ 866,486,000 $ 391,847,000
Other Assets 13,463,000 17,149,000
Other Liabilities (12,348,000) (18,133,000)
Cash Flow Hedging    
Derivatives Fair Value [Line Items]    
Notional Amount 400,000,000  
Other Assets 1,799,000  
Other Liabilities (192,000)  
Other Interest Rate Derivatives    
Derivatives Fair Value [Line Items]    
Notional Amount 458,698,000  
Other Assets 11,664,000  
Other Liabilities (12,148,000)  
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedging    
Derivatives Fair Value [Line Items]    
Notional Amount 400,000,000 0
Other Assets 1,799,000 0
Other Liabilities 192,000 0
Derivatives Not Designated As Hedging Instruments | Other Credit Derivatives    
Derivatives Fair Value [Line Items]    
Notional Amount 7,788,000 8,437,000
Other Assets 0 0
Other Liabilities 8,000 17,000
Derivatives Not Designated As Hedging Instruments | Other Interest Rate Derivatives    
Derivatives Fair Value [Line Items]    
Notional Amount 458,698,000 383,410,000
Other Assets 11,664,000 17,149,000
Other Liabilities $ 12,148,000 $ 18,116,000