Derivative Financial Instruments (Details) (Interest Rate Swap [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flow Hedge [Member]
Derivative [Line Items]
Fixed interest rate	5.23%
Interest rate swaps designated as cash flow hedges, notional amount	$ 10,000,000	$ 10,000,000
Ineffective portion recognized in earnings	0	0	0
Fair values of effective portion of hedges reflected in Other Comprehensive Income	(479,000)	(726,000)
Fair Value Hedge [Member]
Derivative [Line Items]
Interest rate swaps designated as cash flow hedges, notional amount	9,360,000	8,800,000
Average receive rate	1.55%	1.49%
Average pay rate	3.26%	3.11%
Weighted average maturity	17 years 7 months 6 days	19 years 6 months
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Interest rate swaps designated as cash flow hedges, notional amount	39,600,000
Average receive rate	1.85%	1.76%
Average pay rate	3.63%	3.37%
Weighted average maturity	12 years	13 years 9 months 18 days
Interest rate derivative assets, fair value	618,000	803,000
Interest rate derivative liabilities, fair value	$ 618,000	$ 803,000