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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available For Sale Securities Maturities With In One Year Amortized Cost $ 10,311 $ 1,310
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 266,287 361,446
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 267,525 238,020
Available For Sale Securities Maturities After Ten Years Amortized Cost 1,519,856 1,827,209
Available-For-Sale Securities, Amortized Cost Basis 2,063,979 2,427,985
Available-For-Sale Securities, Gross Unrealized Gains 40,718 39,350
Available-For-Sale Securities, Gross Unrealized Losses (4,800) (9,448)
Available-For-Sale Securities 2,099,897 2,457,887
Available For Sale Securities Weighted Average Yield 2.30% 2.28%
Available-For-Sale Securities, Debt Maturities, Next Twelve Months, Fair Value 10,431 1,314
Available-For-Sale Securities, Debt Maturities, Year Two Through Five, Fair Value 267,875 357,194
Available-For-Sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 266,661 236,824
Available-For-Sale Securities, Debt Maturities, After Ten Years, Fair Value 1,554,930 1,862,555
Available For Sale Securities Weighted Average Yield With In One Year 1.78% 2.93%
Available For Sale Securities Weighted Average Yield After One Through Five Years 2.30% 2.07%
Available For Sale Securities Weighted Average Yield After Five Through Ten Years 2.43% 2.56%
Available For Sale Securities Weighted Average Yield After Ten Years 2.28% 2.28%
United States Government Sponsored Enterprises Debt Securities [Member]
   
Available For Sale Securities Maturities With In One Year Amortized Cost 10,141 1,000
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 100,665 231,691
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 67,322 107,019
Available For Sale Securities Maturities After Ten Years Amortized Cost 216,631 0
Available-For-Sale Securities, Amortized Cost Basis 394,759 339,710
Available-For-Sale Securities, Gross Unrealized Gains 1,790 2,107
Available-For-Sale Securities, Gross Unrealized Losses (880) 0
Available-For-Sale Securities 395,669 341,817
Available For Sale Securities Weighted Average Yield 1.66% 1.75%
Residential Mortgage Backed Securitiess Debt 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 24,948 2,726
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 149,144 64,309
Available For Sale Securities Maturities After Ten Years Amortized Cost 1,302,225 1,821,209
Available-For-Sale Securities, Amortized Cost Basis 1,476,317 1,888,244
Available-For-Sale Securities, Gross Unrealized Gains 37,098 36,908
Available-For-Sale Securities, Gross Unrealized Losses (457) (232)
Available-For-Sale Securities 1,512,958 1,924,920
Available For Sale Securities Weighted Average Yield 2.34% 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 812 818
Available For Sale Securities Maturities After Ten Years Amortized Cost 0 0
Available-For-Sale Securities, Amortized Cost Basis 812 818
Available-For-Sale Securities, Gross Unrealized Gains 108 92
Available-For-Sale Securities, Gross Unrealized Losses 0 0
Available-For-Sale Securities 920 910
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 170 310
Available For Sale Securities Maturities After One Through Five Years Amortized Cost 4,023 4,088
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 576 786
Available For Sale Securities Maturities After Ten Years Amortized Cost 0 0
Available-For-Sale Securities, Amortized Cost Basis 4,769 5,184
Available-For-Sale Securities, Gross Unrealized Gains 204 226
Available-For-Sale Securities, Gross Unrealized Losses 0 0
Available-For-Sale Securities 4,973 5,410
Available For Sale Securities Weighted Average Yield 4.02% 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 136,651 122,941
Available For Sale Securities Maturities After Five Through Ten Years Amortized Cost 49,671 65,088
Available For Sale Securities Maturities After Ten Years Amortized Cost 0 5,000
Available-For-Sale Securities, Amortized Cost Basis 186,322 193,029
Available-For-Sale Securities, Gross Unrealized Gains 1,489 0
Available-For-Sale Securities, Gross Unrealized Losses (3,463) (9,216)
Available-For-Sale Securities 184,348 183,813
Available For Sale Securities Weighted Average Yield 3.30% 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 29 17
Available-For-Sale Securities, Gross Unrealized Losses 0 0
Available-For-Sale Securities 1,029 1,017
Available For Sale Securities Weighted Average Yield 2.67% 2.83%
Debt Securities [Member]
   
Available-For-Sale Securities, Debt Maturities, Next Twelve Months, Fair Value 10,431 1,314
Available-For-Sale Securities, Debt Maturities, Year Two Through Five, Fair Value 267,875 357,194
Available-For-Sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 266,661 236,824
Available-For-Sale Securities, Debt Maturities, After Ten Years, Fair Value 1,553,901 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 Two Through Five, Fair Value 0 0
Available-For-Sale Securities, Debt Maturities, Year Six Through Ten, Fair Value 0 0
Available-For-Sale Securities, Debt Maturities, After Ten Years, Fair Value $ 1,029 $ 1,017