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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 138 195
Total temporary impaired securities    
Less than 12 months, Fair Value $ 434,870 $ 187,596
Less than 12 months, Unrealized Losses (3,495) (891)
12 months or longer, Fair Value 109,197 520,087
12 months or longer, Unrealized Losses (2,155) (8,869)
Total, Fair Value 544,067 707,683
Total, Unrealized Losses (5,650) (9,760)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 36,426 23,591
Less than 12 months, Unrealized Losses (706) (145)
12 months or longer, Fair Value 19,410 68,622
12 months or longer, Unrealized Losses (769) (1,544)
Total, Fair Value 55,836 92,213
Total, Unrealized Losses (1,475) (1,689)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 10,753 23,938
Less than 12 months, Unrealized Losses (31) (125)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 10,753 23,938
Total, Unrealized Losses (31) (125)
Residential - U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 344,484 107,755
Less than 12 months, Unrealized Losses (2,500) (487)
12 months or longer, Fair Value 85,081 318,571
12 months or longer, Unrealized Losses (1,287) (5,696)
Total, Fair Value 429,565 426,326
Total, Unrealized Losses (3,787) (6,183)
Commercial - U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 9,723 11,455
Less than 12 months, Unrealized Losses (2) (34)
12 months or longer, Fair Value 0 85,355
12 months or longer, Unrealized Losses 0 (702)
Total, Fair Value 9,723 96,810
Total, Unrealized Losses (2) (736)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value   15,895
Less than 12 months, Unrealized Losses   (92)
12 months or longer, Fair Value   0
12 months or longer, Unrealized Losses   0
Total, Fair Value   15,895
Total, Unrealized Losses   (92)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 33,484 4,962
Less than 12 months, Unrealized Losses (256) (8)
12 months or longer, Fair Value 4,706 47,539
12 months or longer, Unrealized Losses (99) (927)
Total, Fair Value 38,190 52,501
Total, Unrealized Losses $ (355) $ (935)