Allowance For Non-Covered Loan Loss And Credit Quality (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Unallocated allowance, maximum percentage	10.00%
Secured loan portfolio, percentage	79	79
Deferred loan fees	$ 12,298,000	$ 11,080,000	$ 11,700,000
Loans past due as to maturity, days	90 days
Financing receivable modifications recorded investment	96,066,000	124,139,000
Allowance for credit losses associated with receivables	476,000	3,783,000
Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Percentage of loan collateral balance	100.00%
Financing receivable modifications recorded investment	54,800,000	80,600,000
Available commitments for troubled debt restructurings outstanding	0	205,000
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
External appraisal, months	6 months
Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
External appraisal, months	9 months
Allowance Under Previous Methodology [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable modifications recorded investment	400,000	5,400,000
Allowance Under Current Methodology [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for credit losses associated with receivables	$ 0