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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, 2020
Dec. 31, 2019
Investments, Unrealized Loss Position [Line Items]    
Document Period End Date Dec. 31, 2020  
Less than 12 Months Fair Value $ 426,607 $ 481,608
Less than 12 Months Unrealized Loss (2,402) (1,814)
12 Months or More Fair Value 117,126 214,322
12 Months or More Unrealized Loss (2,989) (4,493)
Total Fair Value 543,733 695,930
Total Unrealized Loss (5,391) (6,307)
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 0
12 Months or More Unrealized Loss 0 0
Total Fair Value 0 0
Total Unrealized Loss 0 0
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 0
12 Months or More Unrealized Loss 0 0
Total Fair Value 0 0
Total Unrealized Loss 0 0
Mortgage-backed securities-residential    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 57,872 40,190
Less than 12 Months Unrealized Loss (237) (209)
12 Months or More Fair Value 0 11,063
12 Months or More Unrealized Loss 0 (64)
Total Fair Value 57,872 51,253
Total Unrealized Loss (237) (273)
Mortgage-backed securities-commercial    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 169,825 111,658
Less than 12 Months Unrealized Loss (986) (298)
12 Months or More Fair Value 48,158 104,069
12 Months or More Unrealized Loss (2,598) (3,571)
Total Fair Value 217,983 215,727
Total Unrealized Loss (3,584) (3,869)
Collateralized mortgage obligations    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 49,161 85,248
Less than 12 Months Unrealized Loss (445) (297)
12 Months or More Fair Value 1 30,628
12 Months or More Unrealized Loss 0 (196)
Total Fair Value 49,162 115,876
Total Unrealized Loss (445) (493)
Obligations of state and other political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 60,008 118,623
Less than 12 Months Unrealized Loss (291) (457)
12 Months or More Fair Value 0 7,950
12 Months or More Unrealized Loss 0 (36)
Total Fair Value 60,008 126,573
Total Unrealized Loss (291) (493)
Asset-backed Securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 84,749 125,889
Less than 12 Months Unrealized Loss (435) (553)
12 Months or More Fair Value 68,967 54,963
12 Months or More Unrealized Loss (391) (511)
Total Fair Value 153,716 180,852
Total Unrealized Loss (826) (1,064)
Other securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 Months Fair Value 4,992 0
Less than 12 Months Unrealized Loss (8) 0
12 Months or More Fair Value 0 5,649
12 Months or More Unrealized Loss 0 (115)
Total Fair Value 4,992 5,649
Total Unrealized Loss $ (8) $ (115)