Summary of Significant Accounting Policies and New Accounting Pronouncements Charge-off and Nonaccrual Policies and Practices (Details)	12 Months Ended
	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Delinquency threshold for loss reserves	90 days
Consumer Loan [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Period of consecutive payments	3 months
Delinquent threshold period for write-offs	6 months
Nonaccrual status delinquent threshold period	3 months
Number of qualifying payments to resume accrual of interest	6
Broker price opinion or appraisals number of days	180 days
Number of days valuation is determined	90 days
Consumer Loan [Member] | Consumer Other Financing Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Period of consecutive payments	3 months
Delinquent threshold period for write-offs	6 months
Nonaccrual status delinquent threshold period	3 months
Consumer Loan [Member] | Credit Card Receivable [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Delinquent threshold period for write-offs	6 months
Number of days after notification	60 days
Number of days delinquent	180 days