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Investments (Maturity Information) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Investment securities available for sale      
Total investment securities available for sale, cost $ 5,191,635 $ 5,192,419 $ 4,606,093
Total investment securities available for sale, fair value 5,184,976 5,226,228 4,634,248
Investment securities held to maturity      
Maturing in one through five years, cost 1,040 1,242 1,470
Maturing in five through ten years, cost 14 18 4
Maturing in over ten years, cost 76 82 104
Investment securities held to maturity 1,130 [1] 1,342 [2] 1,578 [1]
Maturing in one through five years, fair value 1,074 1,309 1,568
Maturing in five through ten years, fair value 6 11 4
Maturing in over ten years, fair value 120 128 142
Total investment securities held to maturity, fair value 1,200 1,448 1,714
Debt Securities
     
Investment securities available for sale      
Maturing in one year or less, cost 2,139,800 2,288,556 2,424,304
Maturing in one through five years, cost 2,255,416 2,323,222 1,953,001
Maturing in five through ten years, cost 337,666 194,398 71,914
Maturing in over ten years, cost 458,210 385,700 156,033
Maturing in one year or less, fair value 2,137,724 2,289,859 2,425,612
Maturing in one through five years, fair value 2,243,828 2,329,207 1,954,357
Maturing in five through ten years, fair value 331,321 196,371 72,533
Maturing in over ten years, fair value 451,510 394,426 163,508
Equity Securities
     
Investment securities available for sale      
Total investment securities available for sale, cost 543 543 841
Total investment securities available for sale, fair value $ 20,593 $ 16,365 $ 18,238
[1] Unaudited
[2] Derived from 2012 Annual Report on Form 10-K.