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Investment Securities (Summary Of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Investment [Line Items]    
Held-to-maturity, Amortized cost $ 796,549 $ 851,731
Held-to-maturity, Gross unrealized gains, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 55,811 [1] 43,927 [1]
Held-to-maturity, Carrying value 740,738 807,804
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 14,140 9,317
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 99,110 87,147
Held-to-maturity, fair value 655,768 729,974
Available-for-sale debt securities, Amortized cost 3,664,843  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 81,224 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 836,416 [1]  
Available-for-sale debt securities, Carrying value 2,909,651  
Available-for-sale debt securities, Estimated fair value 2,909,651  
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 securities, Estimated fair value   3,068,028
Available-for-sale, Amortized cost 3,881,564 4,099,729
Available-for-sale, Gross unrealized gains, Recognized in OCI 82,044 [1] 56,399 [1]
Available-for-sale, Gross unrealized losses, Recognized in OCI 836,416 [1] 925,333 [1]
Available-for-sale, Carrying value 3,127,192 3,230,795
Available-for-sale, Estimated fair value 3,127,192 3,230,795
Municipal Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 511,354 564,468
Held-to-maturity, Gross unrealized gains, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Carrying value 511,354 564,468
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 13,674 8,807
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 922 1,083
Held-to-maturity, fair value 524,106 572,192
Available-for-sale debt securities, Amortized cost 112,467 120,677
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 3,355 [1] 3,191 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 2,175 [1] 1,700 [1]
Available-for-sale debt securities, Carrying value 113,647 122,168
Available-for-sale debt securities, Estimated fair value 113,647 122,168
Trust Preferred Securities - Banks And Insurance [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 262,078 262,853
Held-to-maturity, Gross unrealized gains, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 52,997 [1] 40,546 [1]
Held-to-maturity, Carrying value 209,081 222,307
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 231 207
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 90,575 78,191
Held-to-maturity, fair value 118,737 144,323
Available-for-sale debt securities, Amortized cost 1,740,291  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 26,059 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 801,062 [1]  
Available-for-sale debt securities, Carrying value 965,288  
Available-for-sale debt securities, Estimated fair value 965,288  
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 securities, Estimated fair value   929,710
Other [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 23,017 24,310
Held-to-maturity, Gross unrealized gains, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 2,814 [1] 3,381 [1]
Held-to-maturity, Carrying value 20,203 20,929
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 235 303
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 7,613 7,868
Held-to-maturity, fair value 12,825 13,364
Available-for-sale debt securities, Amortized cost 51,519  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 838 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 6,982 [1]  
Available-for-sale debt securities, Carrying value 45,375  
Available-for-sale debt securities, Estimated fair value 45,375  
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 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 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Carrying value 100 100
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 0 0
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 0 5
Held-to-maturity, fair value 100 95
U.S. Treasury Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 4,405 4,330
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 237 [1] 304 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 0 [1] 0 [1]
Available-for-sale debt securities, Carrying value 4,642 4,634
Available-for-sale debt securities, Estimated fair value 4,642 4,634
Agency Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 112,747 153,179
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 4,629 [1] 5,423 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 92 [1] 122 [1]
Available-for-sale debt securities, Carrying value 117,284 158,480
Available-for-sale debt securities, Estimated fair value 117,284 158,480
Agency Guaranteed Mortgage-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 443,714 535,228
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 21,907 [1] 18,211 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 8 [1] 102 [1]
Available-for-sale debt securities, Carrying value 465,613 553,337
Available-for-sale debt securities, Estimated fair value 465,613 553,337
Small Business Administration Loan-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 1,152,178 1,153,039
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 24,107 [1] 12,119 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 1,003 [1] 4,496 [1]
Available-for-sale debt securities, Carrying value 1,175,282 1,160,662
Available-for-sale debt securities, Estimated fair value 1,175,282 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 40,422  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 0 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 25,015 [1]  
Available-for-sale debt securities, Carrying value 15,407  
Available-for-sale debt securities, Estimated fair value 15,407  
Available-for-sale equity securities, Amortized cost   40,259
Available-for-sale equity securities, Gross unrealized gains, Recognized in OCI   0 [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 securities, Estimated fair value   18,645
Auction Rate Securities [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 7,100  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 92 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 79 [1]  
Available-for-sale debt securities, Carrying value 7,113  
Available-for-sale debt securities, Estimated fair value 7,113  
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 securities, Estimated fair value   70,020
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
Mutual Funds And Stock [Member]
   
Investment [Line Items]    
Available-for-sale, Amortized cost 216,721  
Available-for-sale, Gross unrealized gains, Recognized in OCI 820 [1]  
Available-for-sale, Gross unrealized losses, Recognized in OCI 0 [1]  
Available-for-sale, Carrying value 217,541  
Available-for-sale, Estimated fair value $ 217,541  
[1] The gross unrealized losses recognized in OCI on held-to-maturity (“HTM”) securities primarily resulted from a previous transfer of available-for-sale (“AFS”) securities to HTM.