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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Investments, Unrealized Loss Position [Line Items]    
Document Period End Date Sep. 30, 2019  
Less than 12 Months Fair Value $ 388,421 $ 961,572
Less than 12 Months Unrealized Loss (1,090) (6,345)
12 Months or More Fair Value 184,455 882,865
12 Months or More Unrealized Loss (3,732) (23,557)
Total Fair Value 572,876 1,844,437
Total Unrealized Loss (4,822) (29,902)
Other securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 4,160 33,752
Less than 12 Months Unrealized Loss (10) (884)
12 Months or More Fair Value 5,525 4,570
12 Months or More Unrealized Loss (233) (220)
Total Fair Value 9,685 38,322
Total Unrealized Loss (243) (1,104)
Asset-backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 259,681 336,437
Less than 12 Months Unrealized Loss (824) (2,312)
12 Months or More Fair Value 40,776 37,105
12 Months or More Unrealized Loss (283) (498)
Total Fair Value 300,457 373,542
Total Unrealized Loss (1,107) (2,810)
Obligations of state and other political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 14,202 62,805
Less than 12 Months Unrealized Loss (44) (299)
12 Months or More Fair Value 6,714 86,644
12 Months or More Unrealized Loss (78) (2,489)
Total Fair Value 20,916 149,449
Total Unrealized Loss (122) (2,788)
Collateralized Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 43,732 194,795
Less than 12 Months Unrealized Loss (107) (1,546)
12 Months or More Fair Value 29,908 240,514
12 Months or More Unrealized Loss (219) (5,245)
Total Fair Value 73,640 435,309
Total Unrealized Loss (326) (6,791)
Commercial Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 52,281 147,754
Less than 12 Months Unrealized Loss (60) (369)
12 Months or More Fair Value 89,681 232,363
12 Months or More Unrealized Loss (2,820) (7,597)
Total Fair Value 141,962 380,117
Total Unrealized Loss (2,880) (7,966)
Residential Mortgage Backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 14,365 186,029
Less than 12 Months Unrealized Loss (45) (935)
12 Months or More Fair Value 11,851 264,795
12 Months or More Unrealized Loss (99) (7,273)
Total Fair Value 26,216 450,824
Total Unrealized Loss (144) (8,208)
Securities of U.S. government agencies and corporations    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 0 0
Less than 12 Months Unrealized Loss 0 0
12 Months or More Fair Value 0 16,777
12 Months or More Unrealized Loss 0 (233)
Total Fair Value 0 16,777
Total Unrealized Loss 0 (233)
U.S. Treasuries    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 0 0
Less than 12 Months Unrealized Loss 0 0
12 Months or More Fair Value 0 97
12 Months or More Unrealized Loss 0 (2)
Total Fair Value 0 97
Total Unrealized Loss $ 0 $ (2)