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INVESTMENT SECURITIES, Investment Securities in a Continuous Unrealized Loss Position (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Position
Dec. 31, 2017
USD ($)
Position
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 482 249
12 months or longer | Position 59 56
Total | Position 541 305
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,729,339 $ 991,521
12 months or longer 75,600 75,713
Total 1,804,939 1,067,234
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 27,315 7,231
12 months or longer 4,140 2,330
Total $ 31,455 $ 9,561
U.S. Treasury and Agency Securities [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 69 44
12 months or longer | Position 0 0
Total | Position 69 44
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 1,316,113 $ 699,709
12 months or longer 0 0
Total 1,316,113 699,709
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 18,843 4,838
12 months or longer 0 0
Total $ 18,843 $ 4,838
Obligations of State and Political Subdivisions [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 224 45
12 months or longer | Position 0 0
Total | Position 224 45
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 110,119 $ 23,432
12 months or longer 0 0
Total 110,119 23,432
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 1,335 57
12 months or longer 0 0
Total $ 1,335 $ 57
Government Agency Mortgage-Backed Securities [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 148 120
12 months or longer | Position 58 55
Total | Position 206 175
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 225,378 $ 185,716
12 months or longer 75,599 75,712
Total 300,977 261,428
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 5,310 1,433
12 months or longer 4,140 2,330
Total $ 9,450 $ 3,763
Corporate Debt Securities [Member]    
Available-for-Sale Portfolio 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 $ 2,579 $ 2,623
12 months or longer 0 0
Total 2,579 2,623
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 54 25
12 months or longer 0 0
Total $ 54 $ 25
Government Agency Collateralized Mortgage Obligations [Member]    
Available-for-Sale Portfolio in Unrealized Loss Positions, Number of Positions [Abstract]    
Less than 12 months | Position 40 39
12 months or longer | Position 1 1
Total | Position 41 40
Available-for-Sale Securities, in Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months $ 75,150 $ 80,041
12 months or longer 1 1
Total 75,151 80,042
Available-for-Sale Portfolio, Debt Maturities, Gross Unrealized Losses [Abstract]    
Less than 12 months 1,773 878
12 months or longer 0 0
Total $ 1,773 $ 878