Derivative Instruments Derivative Instruments (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Interest Rate Derivatives [Abstract]
Number of interest rate swaps	3
Aggregate notional amount	$ 105,200,000
Change in fair value of interest rate swaps in earnings before cash flow hedge designation	813,000
Termination value of interest rate swap, including accrued interest	8,400,000
Interest Rate Cash Flow Hedges [Abstract]
Change in fair value of swaps in other comprehensive income	1,600,000
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness	266,000
Fair value of swaps in other liabilities	8,400,000
Amount to be reclassified from accumulated other comprehensive income to increase interest expense over next twelve months	$ 1,400,000