Allowance For Non-Covered Loan Loss And Credit Quality (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
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%
Impaired Financing Receivable, Related Allowance	$ 3,784,000	$ 5,239,000
Impaired recorded investment in receivables	5,400,000
Financing Receivable, Allowance for Credit Losses	0
Interest Income Recognized	2,955,000	2,403,000	2,400,000
Commitments for troubled debt restructurings outstanding	205,000	0
Restructured Loans [Member]
Financing receivable modifications recorded investment	$ 80,600,000	$ 84,400,000
Special Mention [Member]
Percentage of non-covered impaired loans classified	3.80%
Substandard [Member]
Percentage of non-covered impaired loans classified	96.00%
Loss [Member]
Percentage of non-covered impaired loans classified	0.20%
Maximum [Member]
External appraisal, months	9
Minimum [Member]
External appraisal, months	6