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INVESTMENT SECURITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
investment
Dec. 31, 2013
investment
INVESTMENT SECURITIES    
Number of investment securities in an unrealized loss position 283 321
Total temporary impaired securities    
Less than 12 months, Fair Value $ 1,041,219 $ 1,252,120
Less than 12 months, Unrealized Losses (27,196) (44,428)
12 months or longer, Fair Value 65,694 37,595
12 months or longer, Unrealized Losses (3,897) (3,680)
Total, Fair Value 1,106,913 1,289,715
Total, Unrealized Losses (31,093) (48,108)
States and political subdivisions debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 101,558 137,176
Less than 12 months, Unrealized Losses (4,194) (8,985)
12 months or longer, Fair Value 48,502 32,747
12 months or longer, Unrealized Losses (3,097) (3,121)
Total, Fair Value 150,060 169,923
Total, Unrealized Losses (7,291) (12,106)
Corporations debt securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 58,999 75,368
Less than 12 months, Unrealized Losses (727) (1,120)
Total, Fair Value 58,999 75,368
Total, Unrealized Losses (727) (1,120)
U.S. Government sponsored entities mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 802,107 909,585
Less than 12 months, Unrealized Losses (19,176) (28,386)
12 months or longer, Fair Value 17,192 4,848
12 months or longer, Unrealized Losses (800) (559)
Total, Fair Value 819,299 914,433
Total, Unrealized Losses (19,976) (28,945)
Non-agency collateralized mortgage obligations mortgage-backed securities
    
Total temporary impaired securities    
Less than 12 months, Fair Value 78,555 129,991
Less than 12 months, Unrealized Losses (3,099) (5,937)
Total, Fair Value 78,555 129,991
Total, Unrealized Losses $ (3,099) $ (5,937)