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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available For Sale Securities Maturities With In One Year Amortized Cost $ 10,967 $ 1,310
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 245,596 361,446
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 277,591 238,020
Available For Sale Securities Maturities After Ten Years Amortized Cost 1,501,715 1,827,209
Available-For-Sale Securities, Amortized Cost Basis 2,035,869 2,427,985
Available-For-Sale Securities, Gross Unrealized Gains 49,353 39,350
Available-For-Sale Securities, Gross Unrealized Losses (3,687) (9,448)
Available-For-Sale Securities 2,081,535 2,457,887
Available For Sale Securities Weighted Average Yield 2.36% 2.28%
Available-For-Sale Securities, Debt Maturities, Next Twelve Months, Fair Value 11,077 1,314
Available-For-Sale Securities, Debt Maturities, Year One Through Five, Fair Value 250,816 357,194
Available-For-Sale Securities, Debt Maturities, Year Five Through Ten, Fair Value 278,875 236,824
Available-For-Sale Securities, Debt Maturities, After Ten Years, Fair Value 1,540,767 1,862,555
Available For Sale Securities Weighted Average Yield With In One Year 1.89% 2.93%
Available For Sale Securities Weighted Average Yield After One Through Five Years 2.24% 2.07%
Available For Sale Securities Weighted Average Yield After Five Through Ten Years 2.61% 2.56%
Available For Sale Securities Weighted Average Yield After Ten Years 2.34% 2.28%
United States Government Sponsored Enterprises Debt Securities [Member]
   
Available For Sale Securities Maturities With In One Year Amortized Cost 10,097 1,000
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 80,584 231,691
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 0 107,019
Available For Sale Securities Maturities After Ten Years Amortized Cost 215,021 0
Available-For-Sale Securities, Amortized Cost Basis 305,702 339,710
Available-For-Sale Securities, Gross Unrealized Gains 2,940 2,107
Available-For-Sale Securities, Gross Unrealized Losses (370) 0
Available-For-Sale Securities 308,272 341,817
Available For Sale Securities Weighted Average Yield 1.51% 1.75%
Residential Mortgage Backed Securitiess Debt Securities [Member]
   
Available For Sale Securities Maturities With In One Year Amortized Cost 565 0
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 23,879 2,726
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 226,893 64,309
Available For Sale Securities Maturities After Ten Years Amortized Cost 1,285,694 1,821,209
Available-For-Sale Securities, Amortized Cost Basis 1,537,031 1,888,244
Available-For-Sale Securities, Gross Unrealized Gains 41,486 36,908
Available-For-Sale Securities, Gross Unrealized Losses (1,773) (232)
Available-For-Sale Securities 1,576,744 1,924,920
Available For Sale Securities Weighted Average Yield 2.42% 2.27%
Commercial Mortgage Backed Securities [Member]
   
Available For Sale Securities Maturities With In One Year Amortized Cost 0 0
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 0 0
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 809 818
Available For Sale Securities Maturities After Ten Years Amortized Cost 0 0
Available-For-Sale Securities, Amortized Cost Basis 809 818
Available-For-Sale Securities, Gross Unrealized Gains 115 92
Available-For-Sale Securities, Gross Unrealized Losses 0 0
Available-For-Sale Securities 924 910
Available For Sale Securities Weighted Average Yield 5.03% 4.86%
Us States and Political Subdivisions [Member]
   
Available For Sale Securities Maturities With In One Year Amortized Cost 305 310
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 4,261 4,088
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 201 786
Available For Sale Securities Maturities After Ten Years Amortized Cost 0 0
Available-For-Sale Securities, Amortized Cost Basis 4,767 5,184
Available-For-Sale Securities, Gross Unrealized Gains 190 226
Available-For-Sale Securities, Gross Unrealized Losses 0 0
Available-For-Sale Securities 4,957 5,410
Available For Sale Securities Weighted Average Yield 4.03% 4.00%
Corporate Note Securities [Member]
   
Available For Sale Securities Maturities With In One Year Amortized Cost 0 0
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 136,872 122,941
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 49,688 65,088
Available For Sale Securities Maturities After Ten Years Amortized Cost 0 5,000
Available-For-Sale Securities, Amortized Cost Basis 186,560 193,029
Available-For-Sale Securities, Gross Unrealized Gains 4,590 0
Available-For-Sale Securities, Gross Unrealized Losses (1,544) (9,216)
Available-For-Sale Securities 189,606 183,813
Available For Sale Securities Weighted Average Yield 3.19% 3.28%
Equity Method Investments [Member]
   
Available For Sale Securities Maturities With In One Year Amortized Cost 0 0
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 0 0
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 0 0
Available For Sale Securities Maturities After Ten Years Amortized Cost 1,000 1,000
Available-For-Sale Securities, Amortized Cost Basis 1,000 1,000
Available-For-Sale Securities, Gross Unrealized Gains 32 17
Available-For-Sale Securities, Gross Unrealized Losses 0 0
Available-For-Sale Securities 1,032 1,017
Available For Sale Securities Weighted Average Yield 2.56% 2.83%
Debt Securities [Member]
   
Available-For-Sale Securities, Debt Maturities, Next Twelve Months, Fair Value 11,077 1,314
Available-For-Sale Securities, Debt Maturities, Year One Through Five, Fair Value 250,816 357,194
Available-For-Sale Securities, Debt Maturities, Year Five Through Ten, Fair Value 278,875 236,824
Available-For-Sale Securities, Debt Maturities, After Ten Years, Fair Value 1,539,735 1,861,538
Equity Securities [Member]
   
Available-For-Sale Securities, Debt Maturities, Next Twelve Months, Fair Value 0 0
Available-For-Sale Securities, Debt Maturities, Year One Through Five, Fair Value 0 0
Available-For-Sale Securities, Debt Maturities, Year Five Through Ten, Fair Value 0 0
Available-For-Sale Securities, Debt Maturities, After Ten Years, Fair Value $ 1,032 $ 1,017