Loans And Allowance For Loan Losses (Schedule Of Credit Risk Profile By Internally Assigned Grade) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Pass [Member] | Residential Mortgages - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	$ 339,348	$ 284,712
Pass-Watch [Member] | Residential Mortgages - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	12,813	7,856
Special Mention [Member] | Residential Mortgages - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	2,239
Substandard [Member] | Residential Mortgages - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	56,927	73,615
Doubtful [Member] | Residential Mortgages - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	940
Residential Mortgages - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	412,267	366,183
Pass [Member] | Residential Mortgages - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	703,342
Pass-Watch [Member] | Residential Mortgages - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	1,089
Special Mention [Member] | Residential Mortgages - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	9,271
Substandard [Member] | Residential Mortgages - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	62,522
Doubtful [Member] | Residential Mortgages - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	764
Loss [Member] | Residential Mortgages - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	5
Residential Mortgages - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	776,993
Pass [Member] | Residential Mortgages - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	140,181	159,885
Pass-Watch [Member] | Residential Mortgages - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	15,081	29,674
Special Mention [Member] | Residential Mortgages - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	4,783	15,220
Substandard [Member] | Residential Mortgages - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	100,103	87,636
Doubtful [Member] | Residential Mortgages - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	2,098	1,091
Residential Mortgages - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	262,246	293,506
Pass [Member] | Total Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	1,182,871	444,597
Pass-Watch [Member] | Total Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	28,983	37,530
Special Mention [Member] | Total Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	16,293	15,220
Substandard [Member] | Total Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	219,552	161,251
Doubtful [Member] | Total Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	3,802	1,091
Loss [Member] | Total Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	5
Total Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Credit Risk Profile By Internally Assigned Grade	$ 1,451,506	$ 659,689