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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 379 223
Total temporary impaired securities    
Less than 12 months, Fair Value $ 634,349 $ 559,687
Less than 12 months, Unrealized Losses (14,551) (4,662)
12 months or longer, Fair Value 605,309 360,929
12 months or longer, Unrealized Losses (30,278) (9,129)
Total, Fair Value 1,239,658 920,616
Total, Unrealized Losses (44,829) (13,791)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 87,069 53,811
Less than 12 months, Unrealized Losses (1,225) (305)
12 months or longer, Fair Value 26,654 15,403
12 months or longer, Unrealized Losses (1,506) (414)
Total, Fair Value 113,723 69,214
Total, Unrealized Losses (2,731) (719)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 54,275 0
Less than 12 months, Unrealized Losses (301) 0
12 months or longer, Fair Value 5,130 5,307
12 months or longer, Unrealized Losses (176) (76)
Total, Fair Value 59,405 5,307
Total, Unrealized Losses (477) (76)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 31,220 10,740
Less than 12 months, Unrealized Losses (602) (69)
12 months or longer, Fair Value 2,699 0
12 months or longer, Unrealized Losses (45) 0
Total, Fair Value 33,919 10,740
Total, Unrealized Losses (647) (69)
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 285,808 335,883
Less than 12 months, Unrealized Losses (7,950) (3,372)
12 months or longer, Fair Value 513,681 340,219
12 months or longer, Unrealized Losses (25,964) (8,639)
Total, Fair Value 799,489 676,102
Total, Unrealized Losses (33,914) (12,011)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 24,690 0
Less than 12 months, Unrealized Losses (831) 0
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 24,690 0
Total, Unrealized Losses (831) 0
Commercial - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 57,509 130,763
Less than 12 months, Unrealized Losses (1,873) (723)
12 months or longer, Fair Value 57,145 0
12 months or longer, Unrealized Losses (2,587) 0
Total, Fair Value 114,654 130,763
Total, Unrealized Losses (4,460) (723)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 93,778 28,490
Less than 12 months, Unrealized Losses (1,769) (193)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 93,778 28,490
Total, Unrealized Losses $ (1,769) $ (193)