Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest Rate Swap [Member]
Derivative [Line Items]
Maturity date of Floating Rate Junior Subordinated Deferrable Interest Debentures	Dec. 31, 2036
Derivative, maturity date	Dec. 31, 2020
Derivative, description of variable rate basis	three month LIBOR	one-month LIBOR
Derivative, basis spread on variable rate (in hundredths)	2.00%		2.00%
Derivative, type of interest rate paid on swap	fixed rate
Derivative, fixed interest rate (in hundredths)	4.90%		4.90%
Interest expense on interest rate swap	$ 30	$ 28	$ 89	$ 83
Interest Rate Swaps II [Member]
Derivative [Line Items]
Interest expense on interest rate swap	$ 27	$ 22	$ 81	$ 68
Number of derivative instruments entered into			3
Number of commercial loans related to interest rate swaps			3