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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 21 155
Total temporary impaired securities    
Less than 12 months, Fair Value $ 110,488 $ 766,126
Less than 12 months, Unrealized Losses (301) (9,937)
12 months or longer, Fair Value 4,181 105,491
12 months or longer, Unrealized Losses (53) (2,830)
Total, Fair Value 114,669 871,617
Total, Unrealized Losses (354) (12,767)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 3,425 30,481
Less than 12 months, Unrealized Losses (26) (532)
12 months or longer, Fair Value 0 12,576
12 months or longer, Unrealized Losses 0 (366)
Total, Fair Value 3,425 43,057
Total, Unrealized Losses (26) (898)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 5,497 32,977
Less than 12 months, Unrealized Losses (12) (227)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 5,497 32,977
Total, Unrealized Losses (12) (227)
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 101,566 507,525
Less than 12 months, Unrealized Losses (263) (6,241)
12 months or longer, Fair Value 4,181 88,271
12 months or longer, Unrealized Losses (53) (2,307)
Total, Fair Value 105,747 595,796
Total, Unrealized Losses $ (316) (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)