Derivatives - (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) item
Derivative [Line Items]
Number of interest rate lock commitments | item					78
Number of forward contracts | item			9
Notional amount	$ 10,000		$ 10,000
Gain (loss) related to hedge ineffectiveness	207	$ (462)	385	$ (1,100)
Termination value of derivatives in net liability position	1,100		1,100		$ 1,300
Collateral Already Posted, Aggregate Fair Value	2,800		$ 2,800		800
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional amount					13,800
Number OF Interest Rate Loack Commitments Member
Derivative [Line Items]
Number of interest rate lock commitments | item			59
Interest Rate Lock Commitments Notional Amount Member
Derivative [Line Items]
Notional amount	$ 12,400		$ 12,400
Forward Contract Notional [Member]
Derivative [Line Items]
Notional amount					$ 11,800
Designated as Hedging Instrument [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Number of interest rate swaps held | item	52		52		42
Notional amount	$ 372,100		$ 372,100		$ 313,000
Not Designated as Hedging Instrument [Member] | Interest rate swap derivatives [Member]
Derivative [Line Items]
Number of interest rate swaps held | item	39		39		36
Notional amount	$ 161,300		$ 161,300		$ 132,600