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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 242 155
Total temporary impaired securities    
Less than 12 months, Fair Value $ 930,710 $ 766,126
Less than 12 months, Unrealized Losses (15,836) (9,937)
12 months or longer, Fair Value 3,978 105,491
12 months or longer, Unrealized Losses (223) (2,830)
Total, Fair Value 934,688 871,617
Total, Unrealized Losses (16,059) (12,767)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 85,288 30,481
Less than 12 months, Unrealized Losses (1,797) (532)
12 months or longer, Fair Value 0 12,576
12 months or longer, Unrealized Losses 0 (366)
Total, Fair Value 85,288 43,057
Total, Unrealized Losses (1,797) (898)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 20,357 32,977
Less than 12 months, Unrealized Losses (181) (227)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 20,357 32,977
Total, Unrealized Losses (181) (227)
Residential-U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 648,923 507,525
Less than 12 months, Unrealized Losses (11,766) (6,241)
12 months or longer, Fair Value 3,978 88,271
12 months or longer, Unrealized Losses (223) (2,307)
Total, Fair Value 652,901 595,796
Total, Unrealized Losses (11,989) (8,548)
Residential - Non-government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 30,596 37,975
Less than 12 months, Unrealized Losses (761) (987)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 30,596 37,975
Total, Unrealized Losses (761) (987)
Commercial-U.S. Government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 92,666 94,613
Less than 12 months, Unrealized Losses (920) (989)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 92,666 94,613
Total, Unrealized Losses (920) (989)
Commercial-Non-government sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 52,880 62,555
Less than 12 months, Unrealized Losses (411) (961)
12 months or longer, Fair Value 0 4,644
12 months or longer, Unrealized Losses 0 (157)
Total, Fair Value 52,880 67,199
Total, Unrealized Losses $ (411) $ (1,118)