Significant Accounting Policies Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2012
Building and Improvements [Member] | Minimum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Building and Improvements [Member] | Maximum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Software and Software Development Costs [Member] | Minimum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Software and Software Development Costs [Member] | Maximum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Furniture and Equipment [Member] | Minimum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Furniture and Equipment [Member] | Maximum [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years