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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 51 155
Total temporary impaired securities    
Less than 12 months, Fair Value $ 51,759 $ 766,126
Less than 12 months, Unrealized Losses (208) (9,937)
12 months or longer, Fair Value 263,313 105,491
12 months or longer, Unrealized Losses (1,645) (2,830)
Total, Fair Value 315,072 871,617
Total, Unrealized Losses (1,853) (12,767)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 6,786 30,481
Less than 12 months, Unrealized Losses (88) (532)
12 months or longer, Fair Value 8,640 12,576
12 months or longer, Unrealized Losses (268) (366)
Total, Fair Value 15,426 43,057
Total, Unrealized Losses (356) (898)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value   32,977
Less than 12 months, Unrealized Losses   (227)
12 months or longer, Fair Value   0
12 months or longer, Unrealized Losses   0
Total, Fair Value   32,977
Total, Unrealized Losses   (227)
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 44,973 507,525
Less than 12 months, Unrealized Losses (120) (6,241)
12 months or longer, Fair Value 254,673 88,271
12 months or longer, Unrealized Losses (1,377) (2,307)
Total, Fair Value 299,646 595,796
Total, Unrealized Losses $ (1,497) (8,548)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value   37,975
Less than 12 months, Unrealized Losses   (987)
12 months or longer, Fair Value   0
12 months or longer, Unrealized Losses   0
Total, Fair Value   37,975
Total, Unrealized Losses   (987)
Commercial - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value   94,613
Less than 12 months, Unrealized Losses   (989)
12 months or longer, Fair Value   0
12 months or longer, Unrealized Losses   0
Total, Fair Value   94,613
Total, Unrealized Losses   (989)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value   62,555
Less than 12 months, Unrealized Losses   (961)
12 months or longer, Fair Value   4,644
12 months or longer, Unrealized Losses   (157)
Total, Fair Value   67,199
Total, Unrealized Losses   $ (1,118)