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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 144 242
Total temporary impaired securities    
Less than 12 months, Fair Value $ 522,894 $ 930,710
Less than 12 months, Unrealized Losses (6,390) (15,836)
12 months or longer, Fair Value 163,473 3,978
12 months or longer, Unrealized Losses (3,991) (223)
Total, Fair Value 686,367 934,688
Total, Unrealized Losses (10,381) (16,059)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 30,233 85,288
Less than 12 months, Unrealized Losses (414) (1,797)
12 months or longer, Fair Value 5,591 0
12 months or longer, Unrealized Losses (141) 0
Total, Fair Value 35,824 85,288
Total, Unrealized Losses (555) (1,797)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 0 20,357
Less than 12 months, Unrealized Losses 0 (181)
12 months or longer, Fair Value 5,354 0
12 months or longer, Unrealized Losses (54) 0
Total, Fair Value 5,354 20,357
Total, Unrealized Losses (54) (181)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 12,090 0
Less than 12 months, Unrealized Losses (129) 0
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 12,090 0
Total, Unrealized Losses (129) 0
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 415,136 648,923
Less than 12 months, Unrealized Losses (5,012) (11,766)
12 months or longer, Fair Value 152,528 3,978
12 months or longer, Unrealized Losses (3,796) (223)
Total, Fair Value 567,664 652,901
Total, Unrealized Losses (8,808) (11,989)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 10,129 30,596
Less than 12 months, Unrealized Losses (211) (761)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 10,129 30,596
Total, Unrealized Losses (211) (761)
Commercial - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 40,690 92,666
Less than 12 months, Unrealized Losses (617) (920)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 40,690 92,666
Total, Unrealized Losses (617) (920)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 14,616 52,880
Less than 12 months, Unrealized Losses (7) (411)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 14,616 52,880
Total, Unrealized Losses $ (7) $ (411)