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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, 2017
Dec. 31, 2016
Derivatives Fair Value [Line Items]    
Notional Amount $ 344,726,000 $ 151,213,000
Other Assets 5,981,000 4,317,000
Other Liabilities 994,000 559,000
Cash Flow Hedges    
Derivatives Fair Value [Line Items]    
Notional Amount 250,000,000  
Other Assets 5,030,000  
Other Liabilities 38,000  
Other Interest Rate Swaps    
Derivatives Fair Value [Line Items]    
Notional Amount 94,726,000  
Other Assets 951,000  
Other Liabilities 956,000  
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedges    
Derivatives Fair Value [Line Items]    
Notional Amount 250,000,000 100,000,000
Other Assets 5,030,000 3,719,000
Other Liabilities 38,000  
Derivatives Not Designated As Hedging Instruments | Other Interest Rate Swaps    
Derivatives Fair Value [Line Items]    
Notional Amount 94,726,000 51,213,000
Other Assets 951,000 598,000
Other Liabilities $ 956,000 $ 559,000