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Derivative Instruments and Hedge Activities - Summary of Other Interest Rate Swaps (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional Amount $ 344,726,000 $ 151,213,000
Derivative assets fair value 5,981,000 4,317,000
Derivative liabilities fair value 994,000 $ 559,000
Other Interest Rate Swaps    
Derivative [Line Items]    
Notional Amount 94,726,000  
Derivative assets fair value 951,000  
Derivative liabilities fair value $ 956,000  
Weighted average pay rates 4.38%  
Weighted average receive rates 3.73%  
Weighted average maturity 6 years 3 months 18 days