Derivatives and Hedging Activities (Textual) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$ 4,200,000	$ 12,800,000
Total	100,000,000	75,000,000
Increase (Decrease) in Loans Held-for-sale	(113,000)	87,000	$ (22,000)
Net amortization income	244,000	244,000	244,000
Exposure to Institutional Counterparties	$ 7,100,000	4,700,000
Maximum length of time Company is currently hedging its exposure	5 years
Interest expense	$ 202,000
Customer related positions	9,500,000	16,100,000
Gain (Loss) on Sales of Loans, Net	4,700,000	6,100,000	4,700,000
Notional amount of fair value hedged derivative	0	0	$ 0
Positions Three [Member]
Derivative [Line Items]
Total		$ 25,000,000
Positions Six [Member]
Derivative [Line Items]
Total	$ 25,000,000