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INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Position
Dec. 31, 2016
USD ($)
Position
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 249 268
12 months or longer | Position 56 17
Total | Position 305 285
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 991,521 $ 637,887
12 months or longer 75,713 21,790
Total 1,067,234 659,677
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 7,231 4,840
12 months or longer 2,330 830
Total $ 9,561 $ 5,670
U.S. Treasury and Agency Securities [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 44 13
12 months or longer | Position 0 0
Total | Position 44 13
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 699,709 $ 449,242
12 months or longer 0 0
Total 699,709 449,242
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 4,838 2,118
12 months or longer 0 0
Total $ 4,838 $ 2,118
Obligations of State and Political Subdivisions [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 45 197
12 months or longer | Position 0 0
Total | Position 45 197
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 23,432 $ 102,106
12 months or longer 0 0
Total 23,432 102,106
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 57 1,054
12 months or longer 0 0
Total $ 57 $ 1,054
Government Agency Mortgage-Backed Securities [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 120 57
12 months or longer | Position 55 15
Total | Position 175 72
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 185,716 $ 83,862
12 months or longer 75,712 21,788
Total 261,428 105,650
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 1,433 1,637
12 months or longer 2,330 830
Total $ 3,763 $ 2,467
Corporate Debt Securities [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 1 1
12 months or longer | Position 0 0
Total | Position 1 1
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 2,623 $ 2,677
12 months or longer 0 0
Total 2,623 2,677
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 25 31
12 months or longer 0 0
Total $ 25 $ 31
Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-Sale Securities in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 39 0
12 months or longer | Position 1 2
Total | Position 40 2
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 80,041 $ 0
12 months or longer 1 2
Total 80,042 2
Available-for-Sale Securities, in Unrealized Loss Position, Gross Unrealized Losses [Abstract]    
Less than 12 months 878 0
12 months or longer 0 0
Total $ 878 $ 0