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Investment Securities (Summary Of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Investment [Line Items]    
Held-to-maturity, Amortized cost $ 840,549 $ 851,731
Held-to-maturity, Gross unrealized gains, Recognized in OCI    [1]    [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 43,400 [1] 43,927 [1]
Held-to-maturity, Carrying value 797,149 807,804
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 16,349 9,317
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 85,019 87,147
Held-to-maturity, Estimated fair value 728,479 729,974
Available-for-sale debt securities, Amortized cost 3,872,959  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 62,731 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 893,386 [1]  
Available-for-sale debt securities, Carrying value 3,042,304  
Available-for-sale debt securities, Estimated fair value 3,042,304  
Available-for-sale equity securities, Amortized cost   3,937,123
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI   56,232 [1]
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI   925,327 [1]
Available-for-sale equity securities, Carrying value   3,068,028
Available-for-sale equity securities, Estimated fair value   3,068,028
Available-for-sale, Amortized cost 4,053,584 4,099,729
Available-for-sale, Gross unrealized gains, Recognized in OCI 62,888 [1] 56,399 [1]
Available-for-sale, Gross Unrealized Losses, Recognized in OCI 893,386 [1] 925,333 [1]
Available-for-sale, Carrying value 3,223,086 3,230,795
Available-for-sale, Estimated fair value 3,223,086 3,230,795
Asset-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale, Estimated fair value 935,900  
Municipal Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 553,388 564,468
Held-to-maturity, Gross unrealized gains, Recognized in OCI    [1]    [1]
Held-to-maturity, Carrying value 553,388 564,468
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 15,237 8,807
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 842 1,083
Held-to-maturity, Estimated fair value 567,783 572,192
Available-for-sale debt securities, Amortized cost 117,673 120,677
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 3,565 [1] 3,191 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 1,698 [1] 1,700 [1]
Available-for-sale debt securities, Carrying value 119,540 122,168
Available-for-sale debt securities, Estimated fair value 119,540 122,168
Trust Preferred Securities - Banks And Insurance [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 262,852 262,853
Held-to-maturity, Gross unrealized gains, Recognized in OCI    [1]    [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 40,105 [1] 40,546 [1]
Held-to-maturity, Carrying value 222,747 222,307
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 664 207
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 75,955 78,191
Held-to-maturity, Estimated fair value 147,456 144,323
Available-for-sale debt securities, Amortized cost 1,770,741  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 18,959 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 853,471 [1]  
Available-for-sale debt securities, Carrying value 936,229  
Available-for-sale debt securities, Estimated fair value 936,229  
Available-for-sale equity securities, Amortized cost   1,794,427
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI   15,792 [1]
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI   880,509 [1]
Available-for-sale equity securities, Carrying value   929,710
Available-for-sale equity securities, Estimated fair value   929,710
Other (including ABS CDOs) [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 24,209 24,310
Held-to-maturity, Gross unrealized gains, Recognized in OCI    [1]    [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 3,295 [1] 3,381 [1]
Held-to-maturity, Carrying value 20,914 20,929
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 448 303
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 8,222 7,868
Held-to-maturity, Estimated fair value 13,140 13,364
Available-for-sale debt securities, Amortized cost 55,648  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 1,037 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 10,025 [1]  
Available-for-sale debt securities, Carrying value 46,660  
Available-for-sale debt securities, Estimated fair value 46,660  
Available-for-sale equity securities, Amortized cost   64,646
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI   1,028 [1]
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI   15,302 [1]
Available-for-sale equity securities, Carrying value   50,372
Available-for-sale equity securities, Estimated fair value   50,372
Other Debt Securities [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 100 100
Held-to-maturity, Gross unrealized gains, Recognized in OCI    [1]    [1]
Held-to-maturity, Carrying value 100 100
Held-to-maturity, Gross unrealized losses, Not recognized in OCI    5
Held-to-maturity, Estimated fair value 100 95
U.S. Treasury Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 4,355 4,330
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 277 [1] 304 [1]
Available-for-sale debt securities, Carrying value 4,632 4,634
Available-for-sale debt securities, Estimated fair value 4,632 4,634
Agency Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 134,673 153,179
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 4,447 [1] 5,423 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 142 [1] 122 [1]
Available-for-sale debt securities, Carrying value 138,978 158,480
Available-for-sale debt securities, Estimated fair value 138,978 158,480
Agency Guaranteed Mortgage-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 504,359 535,228
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 18,757 [1] 18,211 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 47 [1] 102 [1]
Available-for-sale debt securities, Carrying value 523,069 553,337
Available-for-sale debt securities, Estimated fair value 523,069 553,337
Small Business Administration Loan-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 1,203,808 1,153,039
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 15,507 [1] 12,119 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 2,992 [1] 4,496 [1]
Available-for-sale debt securities, Carrying value 1,216,323 1,160,662
Available-for-sale debt securities, Estimated fair value 1,216,323 1,160,662
Trust Preferred Securities - Real Estate Investment Trusts [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 40,300  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI    [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 24,300 [1]  
Available-for-sale debt securities, Carrying value 16,000  
Available-for-sale debt securities, Estimated fair value 16,000  
Available-for-sale equity securities, Amortized cost   40,259
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI      [1]
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI   21,614 [1]
Available-for-sale equity securities, Carrying value   18,645
Available-for-sale equity securities, Estimated fair value   18,645
Auction Rate Securities [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 41,402  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 182 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 711 [1]  
Available-for-sale debt securities, Carrying value 40,873  
Available-for-sale debt securities, Estimated fair value 40,873  
Available-for-sale equity securities, Amortized cost   71,338
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI   164 [1]
Available-for-sale equity securities, Gross unrealized losses, Recognized in OCI   1,482 [1]
Available-for-sale equity securities, Carrying value   70,020
Available-for-sale equity securities, Estimated fair value   70,020
Mutual Funds And Stock [Member]
   
Investment [Line Items]    
Available-for-sale, Amortized cost 180,625  
Available-for-sale, Gross unrealized gains, Recognized in OCI 157 [1]  
Available-for-sale, Carrying value 180,782  
Available-for-sale, Estimated fair value 180,782  
Mutual Funds And Other [Member]
   
Investment [Line Items]    
Available-for-sale, Amortized cost   162,606
Available-for-sale, Gross unrealized gains, Recognized in OCI   167 [1]
Available-for-sale, Gross Unrealized Losses, Recognized in OCI   6 [1]
Available-for-sale, Carrying value   162,767
Available-for-sale, Estimated fair value   $ 162,767
[1] The gross unrealized losses recognized in OCI resulted from a previous transfer of AFS securities to HTM.