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INVESTMENT SECURITIES (Details 3)
$ in Thousands
Jun. 30, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
INVESTMENT SECURITIES.    
Number of investment securities in an unrealized loss position | item 216 195
Total temporary impaired securities    
Less than 12 months, Fair Value $ 741,892 $ 187,596
Less than 12 months, Unrealized Losses (10,147) (891)
12 months or longer, Fair Value 114,559 520,087
12 months or longer, Unrealized Losses (3,741) (8,869)
Total, Fair Value 856,451 707,683
Total, Unrealized Losses (13,888) (9,760)
States and political subdivisions debt securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 66,678 23,591
Less than 12 months, Unrealized Losses (1,558) (145)
12 months or longer, Fair Value 22,780 68,622
12 months or longer, Unrealized Losses (1,253) (1,544)
Total, Fair Value 89,458 92,213
Total, Unrealized Losses (2,811) (1,689)
Corporate debt securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 26,349 23,938
Less than 12 months, Unrealized Losses (154) (125)
Total, Fair Value 26,349 23,938
Total, Unrealized Losses (154) (125)
Residential - U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 464,847 107,755
Less than 12 months, Unrealized Losses (6,464) (487)
12 months or longer, Fair Value 87,126 318,571
12 months or longer, Unrealized Losses (2,332) (5,696)
Total, Fair Value 551,973 426,326
Total, Unrealized Losses (8,796) (6,183)
Commercial - U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 95,920 11,455
Less than 12 months, Unrealized Losses (658) (34)
12 months or longer, Fair Value   85,355
12 months or longer, Unrealized Losses   (702)
Total, Fair Value 95,920 96,810
Total, Unrealized Losses (658) (736)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 30,478 15,895
Less than 12 months, Unrealized Losses (519) (92)
Total, Fair Value 30,478 15,895
Total, Unrealized Losses (519) (92)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 57,620 4,962
Less than 12 months, Unrealized Losses (794) (8)
12 months or longer, Fair Value 4,653 47,539
12 months or longer, Unrealized Losses (156) (927)
Total, Fair Value 62,273 52,501
Total, Unrealized Losses $ (950) $ (935)