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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value $ 359,064 $ 743,530
Less than 12 Months Unrealized Loss (2,802) (11,565)
12 Months or More Fair Value 315,679 243,220
12 Months or More Unrealized Loss (6,401) (4,533)
Total Fair Value 674,743 986,750
Total Unrealized Loss (9,203) (16,098)
Residential Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 71,312 180,654
Less than 12 Months Unrealized Loss (508) (3,621)
12 Months or More Fair Value 96,048 9,890
12 Months or More Unrealized Loss (2,320) (285)
Total Fair Value 167,360 190,544
Total Unrealized Loss (2,828) (3,906)
U.S. Treasuries    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value   97
Less than 12 Months Unrealized Loss   (1)
12 Months or More Fair Value   0
12 Months or More Unrealized Loss   0
Total Fair Value   97
Total Unrealized Loss   (1)
Securities of U.S. government agencies and corporations    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 6,275 19,917
Less than 12 Months Unrealized Loss (23) (150)
12 Months or More Fair Value 0 0
12 Months or More Unrealized Loss 0 0
Total Fair Value 6,275 19,917
Total Unrealized Loss (23) (150)
Commercial Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 67,611 123,122
Less than 12 Months Unrealized Loss (962) (1,200)
12 Months or More Fair Value 66,749 65,007
12 Months or More Unrealized Loss (1,612) (1,443)
Total Fair Value 134,360 188,129
Total Unrealized Loss (2,574) (2,643)
Collateralized Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 124,023 201,305
Less than 12 Months Unrealized Loss (550) (2,882)
12 Months or More Fair Value 92,035 42,314
12 Months or More Unrealized Loss (1,492) (915)
Total Fair Value 216,058 243,619
Total Unrealized Loss (2,042) (3,797)
Obligations of state and other political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 58,858 94,632
Less than 12 Months Unrealized Loss (505) (2,710)
12 Months or More Fair Value 28,713 12,023
12 Months or More Unrealized Loss (438) (150)
Total Fair Value 87,571 106,655
Total Unrealized Loss (943) (2,860)
Asset-backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 23,707 116,057
Less than 12 Months Unrealized Loss (148) (764)
12 Months or More Fair Value 29,666 92,629
12 Months or More Unrealized Loss (369) (1,249)
Total Fair Value 53,373 208,686
Total Unrealized Loss (517) (2,013)
Other securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 7,278 7,746
Less than 12 Months Unrealized Loss (106) (237)
12 Months or More Fair Value 2,468 21,357
12 Months or More Unrealized Loss (170) (491)
Total Fair Value 9,746 29,103
Total Unrealized Loss $ (276) $ (728)