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Investment Securities (Amortized Cost Table and Fair Value of Held to Maturity and Available for Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis $ 3,494,000 $ 3,329,117 $ 3,311,751
Available-for-sale Securities, Gross Unrealized Gain at End of Period 40,816 34,277 44,838
Available-for-sale Securities, Gross Unrealized Loss at End of Period (56,396) (90,220) (57,197)
Available-for-sale Securities Fair Value 3,478,420 3,273,174 3,299,392
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 3,052,118 2,935,688 2,551,860
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 18,601 6,761 4,077
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (68,853) (118,209) (68,866)
Held-to-maturity Securities, Fair Value 3,052,118 2,935,688 2,551,860
US Government Agencies Debt Securities
      
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 25,000 25,000 25,000
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 0 0 0
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (707) (1,348) (1,193)
Held-to-maturity Securities, Fair Value 24,293 23,652 23,807
U.S. States and political subdivisions debt securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 233,228 258,787 272,254
Available-for-sale Securities, Gross Unrealized Gain at End of Period 8,600 7,376 9,207
Available-for-sale Securities, Gross Unrealized Loss at End of Period (1,023) (3,796) (3,527)
Available-for-sale Securities Fair Value 240,805 262,367 277,934
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 549,850 480,703 436,860
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 10,072 5,335 3,878
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (1,253) (10,459) (9,041)
Held-to-maturity Securities, Fair Value 558,669 475,579 431,697
Residential Mortgage Backed Securities [Member]
      
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost     253,839
Held-to-maturity Securities, Unrecognized Holding Gain End of Period     0
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period     (8,051)
Held-to-maturity Securities, Fair Value     245,788
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 998,698 962,687 1,058,323
Available-for-sale Securities, Gross Unrealized Gain at End of Period 24,965 21,662 27,797
Available-for-sale Securities, Gross Unrealized Loss at End of Period (5,489) (14,427) (10,192)
Available-for-sale Securities Fair Value 1,018,174 969,922 1,075,928
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 624,605 569,960  
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 6,825 1,108  
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (4,933) (11,617)  
Held-to-maturity Securities, Fair Value 626,497 559,451  
Commercial Mortgage Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 86,870 72,048 58,609
Available-for-sale Securities, Gross Unrealized Gain at End of Period 351 7 29
Available-for-sale Securities, Gross Unrealized Loss at End of Period (1,523) (2,488) (2,141)
Available-for-sale Securities Fair Value 85,698 69,567 56,497
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 56,020 56,596 50,352
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 176 0 0
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (445) (1,190) (619)
Held-to-maturity Securities, Fair Value 55,751 55,406 49,733
Residential Collateralized Mortgage-Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 1,627,871 1,566,262 1,586,576
Available-for-sale Securities, Gross Unrealized Gain at End of Period 5,009 4,199 7,272
Available-for-sale Securities, Gross Unrealized Loss at End of Period (34,849) (52,068) (27,120)
Available-for-sale Securities Fair Value 1,598,031 1,518,393 1,566,728
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 1,450,479 1,464,732 1,510,374
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 114 0 67
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (54,263) (81,818) (41,674)
Held-to-maturity Securities, Fair Value 1,396,330 1,382,914 1,468,767
Residential Collateralized Mortgage-Backed Securities Issued by Non-US Government Agency
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 8 9 10
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
Available-for-sale Securities Fair Value 8 9 10
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 0    
Commercial Collateralized Mortgage Backed Securities Issued by US Government Sponsored Enterprises
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 182,151 104,152 108,000
Available-for-sale Securities, Gross Unrealized Gain at End of Period 1,008 273 533
Available-for-sale Securities, Gross Unrealized Loss at End of Period (1,126) (2,157) (1,965)
Available-for-sale Securities Fair Value 182,033 102,268 106,568
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 248,974 240,069 175,384
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 641 6 0
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period (7,252) (11,052) (7,285)
Held-to-maturity Securities, Fair Value 242,363 229,023 168,099
Collateralized Loan Obligations
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 297,334 297,259 159,916
Available-for-sale Securities, Gross Unrealized Gain at End of Period 883 760 0
Available-for-sale Securities, Gross Unrealized Loss at End of Period (4,252) (4,332) (1,821)
Available-for-sale Securities Fair Value 293,965 293,687 158,095
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 0    
Corporate debt securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 61,624 61,596 61,569
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 (8,134) (10,952) (10,431)
Available-for-sale Securities Fair Value 53,490 50,644 51,138
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 92,190 93,628 95,052
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 768 308 132
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period 0 (725) (1,003)
Held-to-maturity Securities, Fair Value 92,958 93,211 94,181
Debt Securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 3,487,784 3,322,800 3,305,257
Available-for-sale Securities, Gross Unrealized Gain at End of Period 40,816 34,277 44,838
Available-for-sale Securities, Gross Unrealized Loss at End of Period (56,396) (90,220) (57,197)
Available-for-sale Securities Fair Value 3,472,204 3,266,857 3,292,898
Marketable Securities and Investments Held at Cost
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis     3,213
Available-for-sale Securities, Gross Unrealized Gain at End of Period     0
Available-for-sale Securities, Gross Unrealized Loss at End of Period     0
Available-for-sale Securities Fair Value     3,213
Other Security Investments
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 3,281 3,281 3,281
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
Available-for-sale Securities Fair Value 3,281 3,281 3,281
Held-to-maturity Securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 6,216 6,317 6,494
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
Available-for-sale Securities Fair Value 6,216 6,317 6,494
Equity Securities
      
Securities available for sale      
Available-for-sale Securities, Amortized Cost Basis 2,935 3,036  
Available-for-sale Securities, Gross Unrealized Gain at End of Period 0 0  
Available-for-sale Securities, Gross Unrealized Loss at End of Period 0 0  
Available-for-sale Securities Fair Value 2,935 3,036 3,213
US Treasury Securities
      
Securities held to maturity      
Held-to-maturity Securities, Amortized Cost 5,000 5,000 4,999
Held-to-maturity Securities, Unrecognized Holding Gain End of Period 5 4 0
Held-to-Maturity Securities, Unrecognized Holding Loss End of Period 0 0 0
Held-to-maturity Securities, Fair Value $ 5,005 $ 5,004 $ 4,999