Finance Receivables And Allowance For Credit Losses (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 days	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum percentage concentration in a single industry	10.00%
Average balance of impaired loans	$ 64,194,000	$ 51,217,000
Interest income	0
Amount of purchased loans, classified as doubtful	24,000,000
Loans placed on nonaccrual when past due, number of days	90
Loan participations	214,600,000
Loan participations sold	120,400,000
Loan participations retained	94,200,000
Loans on nonaccrual status	250,000
Minimum number of days for a loan charge off be recorded	120
Maximum number of days for a loan charge off to be recorded	180
Allowance for loan losses	1,702,000
Increased allowance of loan losses	1,400,000
Charge-offs	5,600,000
Number of days for a loan to be considered to be in payment default	90
Decreased allowance of loan losses subsequently defaulted	600,000
Charge-offs subsequently defaulted	3,000,000
Purchased impaired loans without reasonable cash flow estimate	1,700,000
Troubled debt restructuring modification payment delay period	90
Carrying value of revolving lines of credit loans not impaired	4,000,000
Accretable difference expected to be accreted into future earnings	13,400,000
Accretion recorded as loan interest income	15,300,000
Losses Up To $275.0 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of reimbursement	80.00%
value of reimbursement	275,000,000
Losses In Excess Of $275.0 Up To $467.2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of reimbursement	0.00%
Losses In Excess Of $467.2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of reimbursement	80.00%
value of reimbursement	467,200,000
Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	11,700,000
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	7,100,000	3,800,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	5,800,000	1,000,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Troubled debt restructurings	100,000
Troubled debt restructuring [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses	1,500,000	1,600,000
Minimum [Member] | Losses In Excess Of $275.0 Up To $467.2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
value of reimbursement	275,000,000
Maximum [Member] | Losses In Excess Of $275.0 Up To $467.2 [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
value of reimbursement	$ 467,200,000