Derivative Instruments and Hedge Activities - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative notional amount	$ 329,622,000	$ 329,622,000	$ 151,213,000
Unrealized gain (loss) to be reclassified as an increase to interest expense during the next twelve months	(448,000)	(448,000)
Credit valuation adjustment decrease to non-interest income	(17,000)	(30,000)
Other Interest Rate Swaps
Derivative [Line Items]
Derivative notional amount	79,622,000	$ 79,622,000
Derivative maturity date, start year		Jan. 31, 2020
Derivative maturity date, end year		Apr. 30, 2027
Derivative instruments transaction fees	65,000	$ 179,000
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedges
Derivative [Line Items]
Derivative notional amount	250,000,000	250,000,000	$ 100,000,000
Federal Home Loan Bank Advances | Interest Rate Swaps
Derivative [Line Items]
Interest expense on swap transaction	213,000	267,000
Federal Home Loan Bank Advances | Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedges
Derivative [Line Items]
Derivative notional amount	$ 250,000,000	$ 250,000,000