Fair Value Instruments Measured at Fair Value (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Fair Value Instruments Measured at Fair Value (Textual) [Abstract]
Transfers out consisted of charge-offs	$ 0
Recorded sales	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Instruments Measured at Fair Value (Textual) [Abstract]
Loans classified as Level 3 transfers in	18.5
Loans classified as Level 3 transfers out	4.6
Other real estate owned and other reductions	1.7
Other real estate owned and other reductions classified as level 3 transfers out	15.9
Valuation write downs	2.1
Other real estate revenue	13.8
Other real estate owned and other reductions classified as level three transfers in	$ 2.9