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INVESTMENTS IN DEBT AND EQUITY SECURITIES (Securities Available for Sale) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities Maturities With In One Year Amortized Cost $ 10,483 $ 14,799
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost 210,153 226,796
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost 118,423 250,522
Available-for-sale Securities Maturities After Ten Years Amortized Cost 1,074,215 1,117,065
Available-for-sale Securities, Amortized Cost Basis 1,413,274 1,609,182
Available-for-sale Securities, Gross Unrealized Gains 26,462 22,319
Available-for-sale Securities, Gross Unrealized Losses (10,043) (19,756)
Available-for-sale Securities, Fair Value 1,429,693 1,611,745
Available-for-sale Securities Weighted Average Yield 2.24% 2.18%
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 10,531 14,927
Available-for-sale Securities, Debt Maturities, Year One Through Five, Fair Value 216,141 233,338
Available-for-sale Securities, Debt Maturities, Year Five Through Ten, Fair Value 119,237 250,860
Available-for-sale Securities, Debt Maturities, After Ten Years, Fair Value 1,083,784 1,112,620
Available-for-sale Securities Weighted Average Yield With In One Year 2.03% 2.17%
Available-for-sale Securities Weighted Average Yield After One Through Five Years 2.34% 2.23%
Available-for-sale Securities Weighted Average Yield After Five Through Ten Years 2.08% 1.81%
Available-for-sale Securities Weighted Average Yield After Ten Years 2.24% 2.24%
U.S. Government sponsored agencies [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities Maturities With In One Year Amortized Cost 8,387 8,450
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost 30,019 40,243
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost 20,130 88,666
Available-for-sale Securities Maturities After Ten Years Amortized Cost 131,208 135,679
Available-for-sale Securities, Amortized Cost Basis 189,744 273,038
Available-for-sale Securities, Gross Unrealized Gains 4,201 3,525
Available-for-sale Securities, Gross Unrealized Losses (52) (664)
Available-for-sale Securities, Fair Value 193,893 275,899
Available-for-sale Securities Weighted Average Yield 1.36% 1.34%
Residential mortgage-backed [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities Maturities With In One Year Amortized Cost 281 0
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost 57,182 43,943
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost 53,163 115,731
Available-for-sale Securities Maturities After Ten Years Amortized Cost 912,855 951,454
Available-for-sale Securities, Amortized Cost Basis 1,023,481 1,111,128
Available-for-sale Securities, Gross Unrealized Gains 16,996 12,873
Available-for-sale Securities, Gross Unrealized Losses (9,141) (18,214)
Available-for-sale Securities, Fair Value 1,031,336 1,105,787
Available-for-sale Securities Weighted Average Yield 2.34% 2.32%
Commercial mortgage-backed [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
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 786 0
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost 0 793
Available-for-sale Securities Maturities After Ten Years Amortized Cost 0 0
Available-for-sale Securities, Amortized Cost Basis 786 793
Available-for-sale Securities, Gross Unrealized Gains 65 63
Available-for-sale Securities, Gross Unrealized Losses 0 0
Available-for-sale Securities, Fair Value 851 856
Available-for-sale Securities Weighted Average Yield 4.95% 4.94%
State and political subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities Maturities With In One Year Amortized Cost 1,815 1,369
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost 842 2,035
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost 0 200
Available-for-sale Securities Maturities After Ten Years Amortized Cost 28,402 28,432
Available-for-sale Securities, Amortized Cost Basis 31,059 32,036
Available-for-sale Securities, Gross Unrealized Gains 58 81
Available-for-sale Securities, Gross Unrealized Losses (364) (560)
Available-for-sale Securities, Fair Value 30,753 31,557
Available-for-sale Securities Weighted Average Yield 1.17% 1.26%
Corporate notes [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities Maturities With In One Year Amortized Cost 0 4,980
Available-for-sale Securities Maturities After One Through Five Years Amortized Cost 121,324 140,575
Available-for-sale Securities Maturities After Five Through Ten Years Amortized Cost 45,130 45,132
Available-for-sale Securities Maturities After Ten Years Amortized Cost 0 0
Available-for-sale Securities, Amortized Cost Basis 166,454 190,687
Available-for-sale Securities, Gross Unrealized Gains 5,142 5,777
Available-for-sale Securities, Gross Unrealized Losses (441) (261)
Available-for-sale Securities, Fair Value 171,155 196,203
Available-for-sale Securities Weighted Average Yield 2.81% 2.69%
Equity investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
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 1,750 1,500
Available-for-sale Securities, Amortized Cost Basis 1,750 1,500
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses (45) (57)
Available-for-sale Securities, Fair Value 1,705 1,443
Available-for-sale Securities Weighted Average Yield 2.09% 2.17%
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 1,705 1,443
Debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value 10,531 14,927
Available-for-sale Securities, Debt Maturities, Year One Through Five, Fair Value 216,141 233,338
Available-for-sale Securities, Debt Maturities, Year Five Through Ten, Fair Value 119,237 250,860
Available-for-sale Securities, Debt Maturities, After Ten Years, Fair Value $ 1,082,079 $ 1,111,177