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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 335 223
Total temporary impaired securities    
Less than 12 months, Fair Value $ 929,628 $ 559,687
Less than 12 months, Unrealized Losses (17,670) (4,662)
12 months or longer, Fair Value 341,844 360,929
12 months or longer, Unrealized Losses (14,733) (9,129)
Total, Fair Value 1,271,472 920,616
Total, Unrealized Losses (32,403) (13,791)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 81,236 53,811
Less than 12 months, Unrealized Losses (1,043) (305)
12 months or longer, Fair Value 14,893 15,403
12 months or longer, Unrealized Losses (887) (414)
Total, Fair Value 96,129 69,214
Total, Unrealized Losses (1,930) (719)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 44,658 0
Less than 12 months, Unrealized Losses (245) 0
12 months or longer, Fair Value 5,177 5,307
12 months or longer, Unrealized Losses (181) (76)
Total, Fair Value 49,835 5,307
Total, Unrealized Losses (426) (76)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 10,852 10,740
Less than 12 months, Unrealized Losses (79) (69)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 10,852 10,740
Total, Unrealized Losses (79) (69)
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 550,723 335,883
Less than 12 months, Unrealized Losses (10,744) (3,372)
12 months or longer, Fair Value 321,774 340,219
12 months or longer, Unrealized Losses (13,665) (8,639)
Total, Fair Value 872,497 676,102
Total, Unrealized Losses (24,409) (12,011)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 26,466 0
Less than 12 months, Unrealized Losses (623) 0
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 26,466 0
Total, Unrealized Losses (623) 0
Commercial - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 131,718 130,763
Less than 12 months, Unrealized Losses (3,369) (723)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 131,718 130,763
Total, Unrealized Losses (3,369) (723)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 83,975 28,490
Less than 12 months, Unrealized Losses (1,567) (193)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 83,975 28,490
Total, Unrealized Losses $ (1,567) $ (193)