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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Investments, Unrealized Loss Position [Line Items] |  |
Document Period End Date | Dec. 31, 2019 |
Less than 12 Months Fair Value | $ 481,608 | $ 961,572
Less than 12 Months Unrealized Loss | (1,814) | (6,345)
12 Months or More Fair Value | 214,322 | 882,865
12 Months or More Unrealized Loss | (4,493) | (23,557)
Total Fair Value | 695,930 | 1,844,437
Total Unrealized Loss | (6,307) | (29,902)
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)
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)
Mortgage-backed securities-residential |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 40,190 | 186,029
Less than 12 Months Unrealized Loss | (209) | (935)
12 Months or More Fair Value | 11,063 | 264,795
12 Months or More Unrealized Loss | (64) | (7,273)
Total Fair Value | 51,253 | 450,824
Total Unrealized Loss | (273) | (8,208)
Mortgage-backed securities-commercial |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 111,658 | 147,754
Less than 12 Months Unrealized Loss | (298) | (369)
12 Months or More Fair Value | 104,069 | 232,363
12 Months or More Unrealized Loss | (3,571) | (7,597)
Total Fair Value | 215,727 | 380,117
Total Unrealized Loss | (3,869) | (7,966)
Collateralized mortgage obligations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 85,248 | 194,795
Less than 12 Months Unrealized Loss | (297) | (1,546)
12 Months or More Fair Value | 30,628 | 240,514
12 Months or More Unrealized Loss | (196) | (5,245)
Total Fair Value | 115,876 | 435,309
Total Unrealized Loss | (493) | (6,791)
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 118,623 | 62,805
Less than 12 Months Unrealized Loss | (457) | (299)
12 Months or More Fair Value | 7,950 | 86,644
12 Months or More Unrealized Loss | (36) | (2,489)
Total Fair Value | 126,573 | 149,449
Total Unrealized Loss | (493) | (2,788)
Asset-backed Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 125,889 | 336,437
Less than 12 Months Unrealized Loss | (553) | (2,312)
12 Months or More Fair Value | 54,963 | 37,105
12 Months or More Unrealized Loss | (511) | (498)
Total Fair Value | 180,852 | 373,542
Total Unrealized Loss | (1,064) | (2,810)
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Less than 12 Months Fair Value | 0 | 33,752
Less than 12 Months Unrealized Loss | 0 | (884)
12 Months or More Fair Value | 5,649 | 4,570
12 Months or More Unrealized Loss | (115) | (220)
Total Fair Value | 5,649 | 38,322
Total Unrealized Loss | $ (115) | $ (1,104)

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