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Investment Securities (Summary Of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Investment [Line Items]    
Held-to-maturity, Amortized cost $ 829,361 $ 851,731
Held-to-maturity, Gross unrealized gains, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 56,345 [1] 43,927 [1]
Held-to-maturity, Carrying value 773,016 807,804
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 15,308 9,317
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 72,614 87,147
Held-to-maturity, fair value 715,710 729,974
Available-for-sale debt securities, Amortized cost 3,776,756  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 61,852 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 883,994 [1]  
Available-for-sale debt securities, Carrying value 2,954,614  
Available-for-sale debt securities, Estimated fair value 2,954,614  
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 3,989,548 4,099,729
Available-for-sale, Gross unrealized gains, Recognized in OCI 62,054 [1] 56,399 [1]
Available-for-sale, Gross unrealized losses, Recognized in OCI 884,012 [1] 925,333 [1]
Available-for-sale, Carrying value 3,167,590 3,230,795
Available-for-sale, Estimated fair value 3,167,590 3,230,795
Municipal Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 543,367 564,468
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 543,367 564,468
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 14,780 8,807
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 435 1,083
Held-to-maturity, fair value 557,712 572,192
Available-for-sale debt securities, Amortized cost 118,189 120,677
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 3,273 [1] 3,191 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 2,385 [1] 1,700 [1]
Available-for-sale debt securities, Carrying value 119,077 122,168
Available-for-sale debt securities, Estimated fair value 119,077 122,168
Trust Preferred Securities - Banks And Insurance [Member] | Asset-Backed Securities [Member]
   
Investment [Line Items]    
Held-to-maturity, Amortized cost 262,511 262,853
Held-to-maturity, Gross unrealized gains, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 53,472 [1] 40,546 [1]
Held-to-maturity, Carrying value 209,039 222,307
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 282 207
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 63,637 78,191
Held-to-maturity, fair value 145,684 144,323
Available-for-sale debt securities, Amortized cost 1,757,601  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 13,052 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 844,019 [1]  
Available-for-sale debt securities, Carrying value 926,634  
Available-for-sale debt securities, Estimated fair value 926,634  
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 23,383 24,310
Held-to-maturity, Gross unrealized gains, Recognized in OCI 0 [1] 0 [1]
Held-to-maturity, Gross unrealized losses, Recognized in OCI 2,873 [1] 3,381 [1]
Held-to-maturity, Carrying value 20,510 20,929
Held-to-maturity, Gross unrealized gains, Not recognized in OCI 246 303
Held-to-maturity, Gross unrealized losses, Not recognized in OCI 8,542 7,868
Held-to-maturity, fair value 12,214 13,364
Available-for-sale debt securities, Amortized cost 54,795  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 932 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 9,435 [1]  
Available-for-sale debt securities, Carrying value 46,292  
Available-for-sale debt securities, Estimated fair value 46,292  
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 4,379 4,330
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 259 [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 4,638 4,634
Available-for-sale debt securities, Estimated fair value 4,638 4,634
Agency Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 138,364 153,179
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 5,298 [1] 5,423 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 138 [1] 122 [1]
Available-for-sale debt securities, Carrying value 143,524 158,480
Available-for-sale debt securities, Estimated fair value 143,524 158,480
Agency Guaranteed Mortgage-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 476,200 535,228
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 20,463 [1] 18,211 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 50 [1] 102 [1]
Available-for-sale debt securities, Carrying value 496,613 553,337
Available-for-sale debt securities, Estimated fair value 496,613 553,337
Small Business Administration Loan-Backed Securities [Member]
   
Investment [Line Items]    
Available-for-sale debt securities, Amortized cost 1,179,718 1,153,039
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 18,481 [1] 12,119 [1]
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 1,960 [1] 4,496 [1]
Available-for-sale debt securities, Carrying value 1,196,239 1,160,662
Available-for-sale debt securities, Estimated fair value 1,196,239 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 40,361  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 0 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 25,930 [1]  
Available-for-sale debt securities, Carrying value 14,431  
Available-for-sale debt securities, Estimated fair value 14,431  
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 7,149  
Available-for-sale debt securities, Gross unrealized gains, Recognized in OCI 94 [1]  
Available-for-sale debt securities, Gross unrealized losses, Recognized in OCI 77 [1]  
Available-for-sale debt securities, Carrying value 7,166  
Available-for-sale debt securities, Estimated fair value 7,166  
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 212,792  
Available-for-sale, Gross unrealized gains, Recognized in OCI 202 [1]  
Available-for-sale, Gross unrealized losses, Recognized in OCI 18 [1]  
Available-for-sale, Carrying value 212,976  
Available-for-sale, Estimated fair value $ 212,976  
[1] The gross unrealized losses recognized in OCI resulted from a previous transfer of available-for-sale (“AFS”) securities to held-to-maturity (“HTM”).