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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 155 195
Total temporary impaired securities    
Less than 12 months, Fair Value $ 766,126 $ 187,596
Less than 12 months, Unrealized Losses (9,937) (891)
12 months or longer, Fair Value 105,491 520,087
12 months or longer, Unrealized Losses (2,830) (8,869)
Total, Fair Value 871,617 707,683
Total, Unrealized Losses (12,767) (9,760)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 30,481 23,591
Less than 12 months, Unrealized Losses (532) (145)
12 months or longer, Fair Value 12,576 68,622
12 months or longer, Unrealized Losses (366) (1,544)
Total, Fair Value 43,057 92,213
Total, Unrealized Losses (898) (1,689)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 32,977 23,938
Less than 12 months, Unrealized Losses (227) (125)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 32,977 23,938
Total, Unrealized Losses (227) (125)
Residential - U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 507,525 107,755
Less than 12 months, Unrealized Losses (6,241) (487)
12 months or longer, Fair Value 88,271 318,571
12 months or longer, Unrealized Losses (2,307) (5,696)
Total, Fair Value 595,796 426,326
Total, Unrealized Losses (8,548) (6,183)
Residential - Non-government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 37,975 15,895
Less than 12 months, Unrealized Losses (987) (92)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 37,975 15,895
Total, Unrealized Losses (987) (92)
Commercial - U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 94,613 11,455
Less than 12 months, Unrealized Losses (989) (34)
12 months or longer, Fair Value 0 85,355
12 months or longer, Unrealized Losses 0 (702)
Total, Fair Value 94,613 96,810
Total, Unrealized Losses (989) (736)
Commercial - Non-government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 62,555 4,962
Less than 12 months, Unrealized Losses (961) (8)
12 months or longer, Fair Value 4,644 47,539
12 months or longer, Unrealized Losses (157) (927)
Total, Fair Value 67,199 52,501
Total, Unrealized Losses $ (1,118) $ (935)