Significant Accounting Policies (Premises and Equipment) (Details)	12 Months Ended
	Dec. 31, 2012
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful lives	39 years
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful lives	25 years
Other Depreciable Assets Excluding Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful lives	10 years
Other Depreciable Assets Excluding Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, estimated useful lives	3 years