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Derivative Instruments and Hedge Activities - Summary of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Derivatives Fair Value [Line Items]    
Notional Amount $ 341,358,000 $ 548,969,000
Other Assets 7,960,000 10,740,000
Other Liabilities 8,519,000 4,243,000
Other Interest Rate Derivatives    
Derivatives Fair Value [Line Items]    
Notional Amount 332,056,000  
Other Assets 7,960,000  
Other Liabilities 8,507,000  
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedges    
Derivatives Fair Value [Line Items]    
Notional Amount 0 250,000,000
Other Assets   6,699,000
Derivatives Not Designated As Hedging Instruments | Other Credit Derivatives    
Derivatives Fair Value [Line Items]    
Notional Amount 9,302,000 4,424,000
Other Liabilities 12,000 6,000
Derivatives Not Designated As Hedging Instruments | Other Interest Rate Derivatives    
Derivatives Fair Value [Line Items]    
Notional Amount 332,056,000 294,545,000
Other Assets 7,960,000 4,041,000
Other Liabilities $ 8,507,000 $ 4,237,000