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Investment Securities (Fair Value, Unrealized Losses, And Number Of Issuances Of The Temporarily Impaired Securities) (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended12 Months Ended
Sep. 30, 2011
securities
years
Dec. 31, 2010
securities
years
Schedule of Investments [Line Items]  
Fair Value of securities held-to-maturity, Less than 12 months$ 17,902$ 220,554
Fair Value of securities held-to-maturity, 12 months or longer8,354 
Fair Value of securities held-to-maturity, Total26,256220,554
Unrealized Losses on securities held-to-maturity, Less than 12 months55610,612
Unrealized Losses on securities held-to-maturity, 12 months or longer197 
Unrealized Losses on securities held-to-maturity, Total75310,612
No. of Issuances of securities held-to-maturity, Less than 12 months3125
No. of Issuances of securities held-to-maturity, 12 months or longer6 
No. of Issuances of securities held-to-maturity, Total9125
Fair Value of securities available-for-sale, Less than 12 months313,7641,023,959
Fair Value of securities available-for-sale, 12 months or longer132,14811,286
Fair Value of securities available-for-sale, Total445,9121,035,245
Unrealized Losses of securities available-for-sale, Less than 12 months13,30420,427
Unrealized Losses of securities available-for-sale, 12 months or longer13,133239
Unrealized Losses of securities available-for-sale, Total26,43720,666
No. of Issuances of securities available-for-sale, Less than 12 months3159
No. of Issuances of securities available-for-sale, 12 months or longer259
No. of Issuances of securities available-for-sale, Total5668
U.S. Treasury Securities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, Less than 12 months 118,828
Fair Value of securities available-for-sale, Total 118,828
Unrealized Losses of securities available-for-sale, Less than 12 months 6,745
Unrealized Losses of securities available-for-sale, Total 6,745
No. of Issuances of securities available-for-sale, Less than 12 months 5
No. of Issuances of securities available-for-sale, Total 5
U.S. Government Sponsored Entities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, Less than 12 months99,932578,118
Fair Value of securities available-for-sale, Total99,932578,118
Unrealized Losses of securities available-for-sale, Less than 12 months836,840
Unrealized Losses of securities available-for-sale, Total836,840
No. of Issuances of securities available-for-sale, Less than 12 months112
No. of Issuances of securities available-for-sale, Total112
State And Municipal Securities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities held-to-maturity, Less than 12 months8,469121,161
Fair Value of securities held-to-maturity, 12 months or longer8,354 
Fair Value of securities held-to-maturity, Total16,823121,161
Unrealized Losses on securities held-to-maturity, Less than 12 months198,946
Unrealized Losses on securities held-to-maturity, 12 months or longer197 
Unrealized Losses on securities held-to-maturity, Total2168,946
No. of Issuances of securities held-to-maturity, Less than 12 months2122
No. of Issuances of securities held-to-maturity, 12 months or longer6 
No. of Issuances of securities held-to-maturity, Total8122
Fair Value of securities available-for-sale, Less than 12 months 1,718
Fair Value of securities available-for-sale, 12 months or longer1,358 
Fair Value of securities available-for-sale, Total1,3581,718
Unrealized Losses of securities available-for-sale, Less than 12 months 157
Unrealized Losses of securities available-for-sale, 12 months or longer8 
Unrealized Losses of securities available-for-sale, Total8157
No. of Issuances of securities available-for-sale, Less than 12 months 2
No. of Issuances of securities available-for-sale, 12 months or longer1 
No. of Issuances of securities available-for-sale, Total12
Corporate Debt Securities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities held-to-maturity, Less than 12 months9,4339,954
Fair Value of securities held-to-maturity, Total9,4339,954
Unrealized Losses on securities held-to-maturity, Less than 12 months53713
Unrealized Losses on securities held-to-maturity, Total53713
No. of Issuances of securities held-to-maturity, Less than 12 months11
No. of Issuances of securities held-to-maturity, Total11
Fair Value of securities available-for-sale, Less than 12 months204,736310,630
Fair Value of securities available-for-sale, 12 months or longer122,902 
Fair Value of securities available-for-sale, Total327,638310,630
Unrealized Losses of securities available-for-sale, Less than 12 months13,1916,438
Unrealized Losses of securities available-for-sale, 12 months or longer12,496 
Unrealized Losses of securities available-for-sale, Total25,6876,438
No. of Issuances of securities available-for-sale, Less than 12 months1930
No. of Issuances of securities available-for-sale, 12 months or longer14 
No. of Issuances of securities available-for-sale, Total3330
Mortgage-Backed Securities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities held-to-maturity, Less than 12 months 89,439
Fair Value of securities held-to-maturity, Total 89,439
Unrealized Losses on securities held-to-maturity, Less than 12 months 1,653
Unrealized Losses on securities held-to-maturity, Total 1,653
No. of Issuances of securities held-to-maturity, Less than 12 months 2
No. of Issuances of securities held-to-maturity, Total 2
Fair Value of securities available-for-sale, Less than 12 months784354
Fair Value of securities available-for-sale, 12 months or longer14932
Fair Value of securities available-for-sale, Total933386
Unrealized Losses of securities available-for-sale, Less than 12 months54
Unrealized Losses of securities available-for-sale, 12 months or longer21
Unrealized Losses of securities available-for-sale, Total75
No. of Issuances of securities available-for-sale, Less than 12 months77
No. of Issuances of securities available-for-sale, 12 months or longer31
No. of Issuances of securities available-for-sale, Total108
Mortgage-Backed Securities-Non-Agency [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, 12 months or longer6,85610,127
Fair Value of securities available-for-sale, Total6,85610,127
Unrealized Losses of securities available-for-sale, 12 months or longer501118
Unrealized Losses of securities available-for-sale, Total501118
No. of Issuances of securities available-for-sale, 12 months or longer23
No. of Issuances of securities available-for-sale, Total33
Collateralized Mortgage Obligations [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, 12 months or longer712887
Fair Value of securities available-for-sale, Total712887
Unrealized Losses of securities available-for-sale, 12 months or longer120115
Unrealized Losses of securities available-for-sale, Total120115
No. of Issuances of securities available-for-sale, 12 months or longer44
No. of Issuances of securities available-for-sale, Total44
Asset-Backed Securities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, 12 months or longer171240
Fair Value of securities available-for-sale, Total171240
Unrealized Losses of securities available-for-sale, 12 months or longer65
Unrealized Losses of securities available-for-sale, Total65
No. of Issuances of securities available-for-sale, 12 months or longer11
No. of Issuances of securities available-for-sale, Total11
Mutual Funds [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, Less than 12 months 3,927
Fair Value of securities available-for-sale, Total 3,927
Unrealized Losses of securities available-for-sale, Less than 12 months 73
Unrealized Losses of securities available-for-sale, Total 73
No. of Issuances of securities available-for-sale, Less than 12 months 1
No. of Issuances of securities available-for-sale, Total 1
Trust Preferred Securities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, Less than 12 months8,31210,384
Fair Value of securities available-for-sale, Total8,31210,384
Unrealized Losses of securities available-for-sale, Less than 12 months25170
Unrealized Losses of securities available-for-sale, Total25170
No. of Issuances of securities available-for-sale, Less than 12 months42
No. of Issuances of securities available-for-sale, Total42
Total Investment Securities [Member]
  
Schedule of Investments [Line Items]  
Fair Value of securities available-for-sale, Less than 12 months331,6661,244,513
Fair Value of securities available-for-sale, 12 months or longer140,50211,286
Fair Value of securities available-for-sale, Total472,1681,255,799
Unrealized Losses of securities available-for-sale, Less than 12 months13,86031,039
Unrealized Losses of securities available-for-sale, 12 months or longer13,330239
Unrealized Losses of securities available-for-sale, Total$ 27,190$ 31,278
No. of Issuances of securities available-for-sale, Less than 12 months34184
No. of Issuances of securities available-for-sale, 12 months or longer319
No. of Issuances of securities available-for-sale, Total65193