Derivatives and Hedging Activities (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) instrument	Dec. 31, 2015 USD ($) instrument
Derivative [Line Items]
Derivative instruments in accumulated other comprehensive income reclassified to interest expense	$ 255
Derivative liability, notional amount	40,000
Derivative liabilities	20,400
Collateral against obligations	$ 21,100
Derivatives Not Designated as a Hedging Instruments [Member] | Interest rate products [Member]
Derivative [Line Items]
Number of derivative instruments held (in instrument) | instrument	34	23
Derivative notional amount	$ 549,500	$ 391,400
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Number of outstanding derivatives | instrument	1