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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Jun. 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 138 242
Total temporary impaired securities    
Less than 12 months, Fair Value $ 620,438 $ 930,710
Less than 12 months, Unrealized Losses (9,418) (15,836)
12 months or longer, Fair Value 17,226 3,978
12 months or longer, Unrealized Losses (468) (223)
Total, Fair Value 637,664 934,688
Total, Unrealized Losses (9,886) (16,059)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 38,303 85,288
Less than 12 months, Unrealized Losses (497) (1,797)
12 months or longer, Fair Value 1,126 0
12 months or longer, Unrealized Losses (24) 0
Total, Fair Value 39,429 85,288
Total, Unrealized Losses (521) (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 5,353 0
12 months or longer, Unrealized Losses (80) 0
Total, Fair Value 5,353 20,357
Total, Unrealized Losses (80) (181)
U.S. Treasury obligations and direct obligations of U.S Government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 3,380  
Less than 12 months, Unrealized Losses (3)  
12 months or longer, Fair Value 0  
12 months or longer, Unrealized Losses 0  
Total, Fair Value 3,380  
Total, Unrealized Losses (3)  
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 547,203 648,923
Less than 12 months, Unrealized Losses (8,383) (11,766)
12 months or longer, Fair Value 10,747 3,978
12 months or longer, Unrealized Losses (364) (223)
Total, Fair Value 557,950 652,901
Total, Unrealized Losses (8,747) (11,989)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 10,506 30,596
Less than 12 months, Unrealized Losses (239) (761)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 10,506 30,596
Total, Unrealized Losses (239) (761)
Commercial - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 11,548 92,666
Less than 12 months, Unrealized Losses (184) (920)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 11,548 92,666
Total, Unrealized Losses (184) (920)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 9,498 52,880
Less than 12 months, Unrealized Losses (112) (411)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 9,498 52,880
Total, Unrealized Losses $ (112) $ (411)