Mortgage Servicing Rights (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Mortgage Servicing Rights (Textual) [Abstract]
Rights of aggregate fair value	3.3	2.8
Maximum [Member]
Mortgage Servicing Rights (Textual) [Abstract]
Range of fair value of mortgage servicing rights using discount rates	7.30%	7.30%
Minimum [Member]
Mortgage Servicing Rights (Textual) [Abstract]
Range of fair value of mortgage servicing rights using discount rates	3.50%	3.50%