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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | $ 978,552 | $ 570,095
Less than 12 Months Unrealized Loss | (14,716) | (4,745)
12 Months or More Fair Value | 347,767 | 335,516
12 Months or More Unrealized Loss | (14,779) | (8,881)
Total Fair Value | 1,326,319 | 905,611
Total Unrealized Loss | (29,495) | (13,626)
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 96 | 97
Less than 12 Months Unrealized Loss | (2) | (1)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 96 | 97
Total Unrealized Loss | (2) | (1)
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 26,347 | 11,092
Less than 12 Months Unrealized Loss | (381) | (76)
12 Months or More Fair Value | 0 | 0
12 Months or More Unrealized Loss | 0 | 0
Total Fair Value | 26,347 | 11,092
Total Unrealized Loss | (381) | (76)
Residential Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 252,396 | 175,183
Less than 12 Months Unrealized Loss | (3,712) | (1,109)
12 Months or More Fair Value | 123,671 | 108,782
12 Months or More Unrealized Loss | (5,794) | (3,025)
Total Fair Value | 376,067 | 283,965
Total Unrealized Loss | (9,506) | (4,134)
Commercial Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 233,201 | 132,818
Less than 12 Months Unrealized Loss | (4,185) | (1,713)
12 Months or More Fair Value | 75,822 | 72,139
12 Months or More Unrealized Loss | (4,038) | (2,704)
Total Fair Value | 309,023 | 204,957
Total Unrealized Loss | (8,223) | (4,417)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 274,159 | 164,909
Less than 12 Months Unrealized Loss | (3,915) | (1,138)
12 Months or More Fair Value | 96,641 | 101,436
12 Months or More Unrealized Loss | (3,674) | (2,325)
Total Fair Value | 370,800 | 266,345
Total Unrealized Loss | (7,589) | (3,463)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 98,207 | 38,450
Less than 12 Months Unrealized Loss | (1,879) | (507)
12 Months or More Fair Value | 21,420 | 21,639
12 Months or More Unrealized Loss | (789) | (435)
Total Fair Value | 119,627 | 60,089
Total Unrealized Loss | (2,668) | (942)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 89,530 | 44,941
Less than 12 Months Unrealized Loss | (613) | (200)
12 Months or More Fair Value | 23,113 | 24,396
12 Months or More Unrealized Loss | (169) | (106)
Total Fair Value | 112,643 | 69,337
Total Unrealized Loss | (782) | (306)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 4,616 | 2,605
Less than 12 Months Unrealized Loss | (29) | (1)
12 Months or More Fair Value | 7,100 | 7,124
12 Months or More Unrealized Loss | (315) | (286)
Total Fair Value | 11,716 | 9,729
Total Unrealized Loss | $ (344) | $ (287)

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