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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Investments, Unrealized Loss Position [Line Items] |  |  |
Proceeds from Sale of Held-to-maturity Securities | $ 0 | $ 0 | $ 4,862
Less than 12 Months Fair Value | 961,572 | 570,095 |
Less than 12 Months Unrealized Loss | (6,345) | (4,745) |
12 Months or More Fair Value | 882,865 | 335,516 |
12 Months or More Unrealized Loss | (23,557) | (8,881) |
Total Fair Value | 1,844,437 | 905,611 |
Total Unrealized Loss | (29,902) | (13,626) |
U.S. Treasuries |  |  |
Investments, Unrealized Loss Position [Line Items] |  |  |
Less than 12 Months Fair Value | 0 | 97 |
Less than 12 Months Unrealized Loss | 0 | (1) |
12 Months or More Fair Value | 97 | 0 |
12 Months or More Unrealized Loss | (2) | 0 |
Total Fair Value | 97 | 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 | 0 | 11,092 |
Less than 12 Months Unrealized Loss | 0 | (76) |
12 Months or More Fair Value | 16,777 | 0 |
12 Months or More Unrealized Loss | (233) | 0 |
Total Fair Value | 16,777 | 11,092 |
Total Unrealized Loss | (233) | (76) |
Residential Mortgage Backed Securities [Member] |  |  |
Investments, Unrealized Loss Position [Line Items] |  |  |
Less than 12 Months Fair Value | 186,029 | 175,183 |
Less than 12 Months Unrealized Loss | (935) | (1,109) |
12 Months or More Fair Value | 264,795 | 108,782 |
12 Months or More Unrealized Loss | (7,273) | (3,025) |
Total Fair Value | 450,824 | 283,965 |
Total Unrealized Loss | (8,208) | (4,134) |
Commercial Mortgage Backed Securities [Member] |  |  |
Investments, Unrealized Loss Position [Line Items] |  |  |
Less than 12 Months Fair Value | 147,754 | 132,818 |
Less than 12 Months Unrealized Loss | (369) | (1,713) |
12 Months or More Fair Value | 232,363 | 72,139 |
12 Months or More Unrealized Loss | (7,597) | (2,704) |
Total Fair Value | 380,117 | 204,957 |
Total Unrealized Loss | (7,966) | (4,417) |
Collateralized Mortgage Backed Securities [Member] |  |  |
Investments, Unrealized Loss Position [Line Items] |  |  |
Less than 12 Months Fair Value | 194,795 | 164,909 |
Less than 12 Months Unrealized Loss | (1,546) | (1,138) |
12 Months or More Fair Value | 240,514 | 101,436 |
12 Months or More Unrealized Loss | (5,245) | (2,325) |
Total Fair Value | 435,309 | 266,345 |
Total Unrealized Loss | (6,791) | (3,463) |
Obligations of state and other political subdivisions |  |  |
Investments, Unrealized Loss Position [Line Items] |  |  |
Less than 12 Months Fair Value | 62,805 | 38,450 |
Less than 12 Months Unrealized Loss | (299) | (507) |
12 Months or More Fair Value | 86,644 | 21,639 |
12 Months or More Unrealized Loss | (2,489) | (435) |
Total Fair Value | 149,449 | 60,089 |
Total Unrealized Loss | (2,788) | (942) |
Asset-backed Securities [Member] |  |  |
Investments, Unrealized Loss Position [Line Items] |  |  |
Less than 12 Months Fair Value | 336,437 | 44,941 |
Less than 12 Months Unrealized Loss | (2,312) | (200) |
12 Months or More Fair Value | 37,105 | 24,396 |
12 Months or More Unrealized Loss | (498) | (106) |
Total Fair Value | 373,542 | 69,337 |
Total Unrealized Loss | (2,810) | (306) |
Other securities |  |  |
Investments, Unrealized Loss Position [Line Items] |  |  |
Less than 12 Months Fair Value | 33,752 | 2,605 |
Less than 12 Months Unrealized Loss | (884) | (1) |
12 Months or More Fair Value | 4,570 | 7,124 |
12 Months or More Unrealized Loss | (220) | (286) |
Total Fair Value | 38,322 | 9,729 |
Total Unrealized Loss | $ (1,104) | $ (287) |

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