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INVESTMENT SECURITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
investment
Dec. 31, 2012
investment
INVESTMENT SECURITIES    
Number of investment securities in an unrealized loss position 321 118
Total temporary impaired securities    
Less than 12 months, Fair Value $ 1,252,120 $ 303,314
Less than 12 months, Unrealized Losses (44,428) (2,795)
12 months or longer, Fair Value 37,595  
12 months or longer, Unrealized Losses (3,680)  
Total, Fair Value 1,289,715 303,314
Total, Unrealized Losses (48,108) (2,795)
States and political subdivisions debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 137,176 73,128
Less than 12 months, Unrealized Losses (8,985) (1,194)
12 months or longer, Fair Value 32,747  
12 months or longer, Unrealized Losses (3,121)  
Total, Fair Value 169,923 73,128
Total, Unrealized Losses (12,106) (1,194)
Corporations debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 75,368 23,205
Less than 12 months, Unrealized Losses (1,120) (63)
Total, Fair Value 75,368 23,205
Total, Unrealized Losses (1,120) (63)
U.S. Government sponsored entities mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 909,585 206,981
Less than 12 months, Unrealized Losses (28,386) (1,538)
12 months or longer, Fair Value 4,848  
12 months or longer, Unrealized Losses (559)  
Total, Fair Value 914,433 206,981
Total, Unrealized Losses (28,945) (1,538)
Non-agency collateralized mortgage obligations mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 129,991  
Less than 12 months, Unrealized Losses (5,937)  
Total, Fair Value 129,991  
Total, Unrealized Losses $ (5,937)