XML 38 R30.htm IDEA: XBRL DOCUMENT v2.4.0.6
Investments (Aggregate Values and Unrealized Gains and Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Investment securities available for sale      
Cost $ 5,247,345 $ 5,192,419 $ 4,434,072
Gross Unrealized Gains 34,137 34,517 29,204
Gross Unrealized Losses 1,804 708 5,537
Fair Value 5,279,678 5,226,228 4,457,739
Investment securities held to maturity      
Cost 1,229 [1] 1,342 [2] 1,688 [1]
U. S. Treasury
     
Investment securities available for sale      
Cost 749,284 823,241 1,065,035
Gross Unrealized Gains 474 403 306
Gross Unrealized Losses 1 12 305
Fair Value 749,757 823,632 1,065,036
Government Agency
     
Investment securities available for sale      
Cost 3,147,363 3,052,040 2,859,197
Gross Unrealized Gains 2,952 3,501 1,228
Gross Unrealized Losses 274 337 5,040
Fair Value 3,150,041 3,055,204 2,855,385
Corporate Bonds
     
Investment securities available for sale      
Cost     225,214
Gross Unrealized Gains     1,214
Gross Unrealized Losses     0
Fair Value     226,428
Residential Mortgage-Backed Securities
     
Investment securities available for sale      
Cost 1,348,765 1,315,211 282,706
Gross Unrealized Gains 10,849 14,787 8,393
Gross Unrealized Losses 1,512 341 191
Fair Value 1,358,102 1,329,657 290,908
Investment securities held to maturity      
Cost 1,229 1,342 1,688
Gross Unrealized Gains 120 133 183
Gross Unrealized Losses 27 27 27
Fair Value 1,322 1,448 1,844
Equity Securities
     
Investment securities available for sale      
Cost 543 543 894
Gross Unrealized Gains 19,860 15,822 18,049
Gross Unrealized Losses 0 0 0
Fair Value 20,403 16,365 18,943
State, County and Municipal
     
Investment securities available for sale      
Cost 546 546 1,026
Gross Unrealized Gains 1 4 14
Gross Unrealized Losses 0 0 1
Fair Value 547 550 1,039
Other Debt Obligations
     
Investment securities available for sale      
Cost 844 838  
Gross Unrealized Gains 1 0  
Gross Unrealized Losses 17 18  
Fair Value $ 828 $ 820  
[1] Unaudited
[2] Derived from 2012 Annual Report on Form 10-K.