Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2013
Significant Accounting Policies details [Line Items]
Charge off threshold for unsecured commercial loans considered uncollectible	90 days
Charge off threshold for closed-end consumer loans and uncollectible loans	120 days
Number of monthly payments before loan charge off	5
Minimum [Member]
Significant Accounting Policies details [Line Items]
Historical loan loss review period (in quarters)	4
Other real estate owned frequency of period reviews	24 months
Maximum [Member]
Significant Accounting Policies details [Line Items]
Historical loan loss review period (in quarters)	8
Other real estate owned frequency of period reviews	12 months