Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 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)	1.70%		1.70%
Derivative, type of interest rate paid on swap	fixed rate
Derivative, fixed interest rate (in hundredths)	4.91%		4.91%
Interest expense on interest rate swap	$ 30	$ 28	$ 59	$ 55
Interest Rate Swaps II [Member]
Derivative [Line Items]
Interest expense on interest rate swap	$ 26	$ 23	$ 54	$ 46
Number of derivative instruments entered into			3
Number of commercial loans related to interest rate swaps			3