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Investment Securities (Amortized Cost Table) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis $ 3,286,109 $ 2,848,771 $ 2,827,822
Available-for-sale Securities Fair Value 3,256,259 2,920,971 2,911,993
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 2,749,934 622,121 620,631
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 2,749,934 622,121 620,631
Held-to-maturity Securities, Fair Value 2,658,433 630,799 631,237
Available-for-sale Securities, Gross Unrealized Gain at End of Period 40,612 85,122 98,609
Available-for-sale Securities, Gross Unrealized Loss at End of Period (70,462) (12,922) (14,438)
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 6,651 8,764 10,623
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (98,152) (86) (17)
US Government Agencies Debt Securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis     35,109
Available-for-sale Securities Fair Value     35,137
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 25,000    
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 23,864    
Held-to-maturity Securities, Fair Value 23,864    
Available-for-sale Securities, Gross Unrealized Gain at End of Period     28
Available-for-sale Securities, Gross Unrealized Loss at End of Period     0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 0    
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (1,136)    
U.S. States and political subdivisions debt securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 267,470 253,198 241,436
Available-for-sale Securities Fair Value 272,224 268,204 258,418
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 453,230 270,005 262,091
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 449,066 275,061 269,020
Held-to-maturity Securities, Fair Value 449,066    
Available-for-sale Securities, Gross Unrealized Gain at End of Period 8,249 15,235 17,003
Available-for-sale Securities, Gross Unrealized Loss at End of Period (3,495) (229) (21)
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 5,093 5,126 6,946
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (9,257) (70) (17)
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 983,255 1,058,005 1,216,671
Available-for-sale Securities Fair Value 999,375 1,107,063 1,277,831
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 377,980    
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 370,470    
Held-to-maturity Securities, Fair Value 370,470    
Available-for-sale Securities, Gross Unrealized Gain at End of Period 26,155 49,058 61,160
Available-for-sale Securities, Gross Unrealized Loss at End of Period (10,035) 0 0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 1,068    
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (8,578)    
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 58,129 52,014 15,434
Available-for-sale Securities Fair Value 55,932 52,036 15,667
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 50,179 33,165 33,149
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 49,166 33,977 33,941
Held-to-maturity Securities, Fair Value 49,166    
Available-for-sale Securities, Gross Unrealized Gain at End of Period 23 428 233
Available-for-sale Securities, Gross Unrealized Loss at End of Period (2,220) (406) 0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 12 812 792
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (1,025) 0 0
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 1,538,991 1,311,501 1,188,072
Available-for-sale Securities Fair Value 1,505,706 1,329,421 1,205,525
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 1,523,792 123,563 129,265
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 1,455,252 124,080 129,661
Held-to-maturity Securities, Fair Value 1,455,252    
Available-for-sale Securities, Gross Unrealized Gain at End of Period 5,710 18,180 17,836
Available-for-sale Securities, Gross Unrealized Loss at End of Period (38,995) (260) (383)
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 179 533 396
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (68,719) (16) 0
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 9 11 12
Available-for-sale Securities Fair Value 9 11 12
Securities held to maturity      
Available-for-sale Securities, Gross Unrealized Gain at End of Period 0 0 0
Available-for-sale Securities, Gross Unrealized Loss at End of Period 0 0 0
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 98,440 109,260 66,316
Available-for-sale Securities Fair Value 97,154 111,343 68,665
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 220,410 98,924 98,961
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 211,474 99,696 100,015
Held-to-maturity Securities, Fair Value 211,474    
Available-for-sale Securities, Gross Unrealized Gain at End of Period 404 2,221 2,349
Available-for-sale Securities, Gross Unrealized Loss at End of Period (1,690) (138) 0
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 0 772 1,054
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (8,936) 0 0
Collateralized Loan Obligations
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 271,856    
Available-for-sale Securities Fair Value 268,632    
Securities held to maturity      
Available-for-sale Securities, Gross Unrealized Gain at End of Period 71    
Available-for-sale Securities, Gross Unrealized Loss at End of Period (3,295)    
Corporate debt securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 61,582 61,541 61,527
Available-for-sale Securities Fair Value 50,850 49,652 47,493
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 94,343 96,464 97,165
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 94,136 97,985 98,600
Held-to-maturity Securities, Fair Value 94,136    
Available-for-sale Securities, Gross Unrealized Gain at End of Period 0 0 0
Available-for-sale Securities, Gross Unrealized Loss at End of Period (10,732) (11,889) (14,034)
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 294 1,521 1,435
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (501) 0 0
Debt Securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 3,279,732 2,845,530 2,824,577
Available-for-sale Securities Fair Value 3,249,882 2,917,730 2,908,748
Securities held to maturity      
Available-for-sale Securities, Gross Unrealized Gain at End of Period 40,612 85,122 98,609
Available-for-sale Securities, Gross Unrealized Loss at End of Period (70,462) (12,922) (14,438)
Marketable Securities and Investments Held at Cost
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 3,096 3,241 3,245
Available-for-sale Securities Fair Value 3,096 3,241 3,245
Securities held to maturity      
Available-for-sale Securities, Gross Unrealized Gain at End of Period 0 0 0
Available-for-sale Securities, Gross Unrealized Loss at End of Period 0 0 0
Other Security Investments
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 3,281    
Available-for-sale Securities Fair Value 3,281    
Securities held to maturity      
Available-for-sale Securities, Gross Unrealized Gain at End of Period 0    
Available-for-sale Securities, Gross Unrealized Loss at End of Period 0    
Equity Securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 6,377    
Available-for-sale Securities Fair Value 6,377 3,241 3,245
Securities held to maturity      
Available-for-sale Securities, Gross Unrealized Gain at End of Period 0    
Available-for-sale Securities, Gross Unrealized Loss at End of Period 0    
US Treasury Securities
      
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 5,000    
Held-to-maturity Securities, Fair Value-Investment Securities Disclosure 5,005    
Held-to-maturity Securities, Fair Value 5,005    
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 5    
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period $ 0