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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
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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)

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