Loans And Allowance For Loan Losses (Summary Of Impaired Loans Disaggregated By Class) (Details) (USD $) In Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	$ 83,622	$ 107,739
Unpaid Principal Balance	83,622	107,739
Investments in impaired loans	17,499	11,952
Average Recorded Investment	97,539	121,966
Interest Income Recognized	591	861
Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		56,835
Unpaid Principal Balance		56,835
Investments in impaired loans		10,648
Average Recorded Investment		63,122
Interest Income Recognized		747
Commercial [Member] | With No Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		22,641
Unpaid Principal Balance		22,641
Investments in impaired loans
Average Recorded Investment		26,472
Interest Income Recognized		224
Commercial [Member] | With A Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		34,194
Unpaid Principal Balance		34,194
Investments in impaired loans		10,648
Average Recorded Investment		36,650
Interest Income Recognized		523
Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	44,317
Unpaid Principal Balance	44,317
Investments in impaired loans	5,958
Average Recorded Investment	50,607
Interest Income Recognized	531
Commercial - Originated [Member] | With No Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	14,288
Unpaid Principal Balance	14,288
Investments in impaired loans
Average Recorded Investment	17,108
Interest Income Recognized	253
Commercial - Originated [Member] | With A Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	30,029
Unpaid Principal Balance	30,029
Investments in impaired loans	5,958
Average Recorded Investment	33,499
Interest Income Recognized	278
Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	32,869	41,917
Unpaid Principal Balance	32,869	41,917
Investments in impaired loans	10,900
Average Recorded Investment	38,203	49,070
Interest Income Recognized
Commercial - Covered [Member] | With No Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		41,917
Unpaid Principal Balance		41,917
Investments in impaired loans
Average Recorded Investment		49,070
Interest Income Recognized
Commercial - Covered [Member] | With A Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	32,869
Unpaid Principal Balance	32,869
Investments in impaired loans	10,900
Average Recorded Investment	38,203
Interest Income Recognized
Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		5,618
Unpaid Principal Balance		5,618
Investments in impaired loans		1,304
Average Recorded Investment		5,959
Interest Income Recognized		114
With No Related Allowance Recorded [Member] | Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		1,263
Unpaid Principal Balance		1,263
Investments in impaired loans
Average Recorded Investment		1,601
Interest Income Recognized		26
With A Related Allowance Recorded [Member] | Residential Mortgages [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		4,355
Unpaid Principal Balance		4,355
Investments in impaired loans		1,304
Average Recorded Investment		4,358
Interest Income Recognized		88
Residential Mortgages - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	5,199
Unpaid Principal Balance	5,199
Investments in impaired loans	641
Average Recorded Investment	6,189
Interest Income Recognized	60
Residential Mortgages - Originated [Member] | With No Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	1,233
Unpaid Principal Balance	1,233
Investments in impaired loans
Average Recorded Investment	1,115
Interest Income Recognized	2
Residential Mortgages - Originated [Member] | With A Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	3,966
Unpaid Principal Balance	3,966
Investments in impaired loans	641
Average Recorded Investment	5,074
Interest Income Recognized	58
Residential Mortgages - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	1,237	3,199
Unpaid Principal Balance	1,237	3,199
Investments in impaired loans
Average Recorded Investment	2,540	3,631
Interest Income Recognized
Residential Mortgages - Covered [Member] | With No Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	1,237	3,199
Unpaid Principal Balance	1,237	3,199
Investments in impaired loans
Average Recorded Investment	2,540	3,631
Interest Income Recognized
Direct Consumer - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		170
Unpaid Principal Balance		170
Investments in impaired loans
Average Recorded Investment		184
Interest Income Recognized
Direct Consumer - Covered [Member] | With No Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans		170
Unpaid Principal Balance		170
Investments in impaired loans
Average Recorded Investment		184
Interest Income Recognized
With No Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	16,758	69,190
Unpaid Principal Balance	16,758	69,190
Investments in impaired loans
Average Recorded Investment	20,763	80,958
Interest Income Recognized	255	250
With A Related Allowance Recorded [Member]
Mortgage Loans on Real Estate [Line Items]
Investments in impaired loans	66,864	38,549
Unpaid Principal Balance	66,864	38,549
Investments in impaired loans	17,499	11,952
Average Recorded Investment	76,776	41,008
Interest Income Recognized	$ 336	$ 611