Allowance For Non-Covered Loan Loss And Credit Quality (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2012 D	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Unallocated allowance, maximum percentage	10.00%
Secured loan portfolio, percentage	80.00%
Loans past due as to maturity, days	90
Percentage of loan collateral balance	100.00%
The recorded investment in receivables	$ 151,180,000	$ 166,279,000
Available commitments for troubled debt restructurings outstanding	108,983,000	124,139,000
Deferred loan fees, net	11,384,000	11,080,000
Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired loans classified as accruing restructured loans	70,200,000	80,600,000
The recorded investment in receivables	3,500,000	5,400,000
Available commitments for troubled debt restructurings outstanding		$ 205,000
Maximum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
External appraisal, months	9
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
External appraisal, months	6