Benefit Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Salary Continuation Plan
Benefit Plans
Amounts expensed	$ 200,000	$ 122,000
Amounts recorded as liability	3,300,000	1,000,000
Directors' Deferred Compensation Plan
Benefit Plans
Amounts recorded as liability	1,200,000	1,100,000
Variable rate basis	prime
Basis spread (as a percent)	1.00%
Interest expense	96,000	823,000
Long-Term Care Insurance Plan
Benefit Plans
Amounts expensed	22,000	19,000
Amounts recorded as liability	115,000	92,000
Long-Term Care Insurance Plan | Maximum
Benefit Plans
Insurance premium recorded in deferred compensation account, on opting out of the plan	$ 4,000