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INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities in an unrealized loss position | security 191 242
Total temporary impaired securities    
Less than 12 months, Fair Value $ 812,189 $ 930,710
Less than 12 months, Unrealized Losses (13,676) (15,836)
12 months or longer, Fair Value 17,746 3,978
12 months or longer, Unrealized Losses (331) (223)
Total, Fair Value 829,935 934,688
Total, Unrealized Losses (14,007) (16,059)
States and political subdivisions    
Total temporary impaired securities    
Less than 12 months, Fair Value 58,442 85,288
Less than 12 months, Unrealized Losses (1,068) (1,797)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 58,442 85,288
Total, Unrealized Losses (1,068) (1,797)
Corporate securities    
Total temporary impaired securities    
Less than 12 months, Fair Value 5,353 20,357
Less than 12 months, Unrealized Losses (105) (181)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 5,353 20,357
Total, Unrealized Losses (105) (181)
Residential - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 609,420 648,923
Less than 12 months, Unrealized Losses (10,516) (11,766)
12 months or longer, Fair Value 17,746 3,978
12 months or longer, Unrealized Losses (331) (223)
Total, Fair Value 627,166 652,901
Total, Unrealized Losses (10,847) (11,989)
Residential - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 29,289 30,596
Less than 12 months, Unrealized Losses (838) (761)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 29,289 30,596
Total, Unrealized Losses (838) (761)
Commercial - U.S. Government-sponsored entities    
Total temporary impaired securities    
Less than 12 months, Fair Value 81,035 92,666
Less than 12 months, Unrealized Losses (1,070) (920)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 81,035 92,666
Total, Unrealized Losses (1,070) (920)
Commercial - Non-government agencies    
Total temporary impaired securities    
Less than 12 months, Fair Value 28,650 52,880
Less than 12 months, Unrealized Losses (79) (411)
12 months or longer, Fair Value 0 0
12 months or longer, Unrealized Losses 0 0
Total, Fair Value 28,650 52,880
Total, Unrealized Losses $ (79) $ (411)