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INVESTMENTS - Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities (Detail)
$ in Thousands
Sep. 30, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 41 50
Fair Value    
Less Than 12 Months $ 88,891 $ 248,365
12 Months or More 98,223 94,778
Total 187,114 343,143
Unrealized Losses    
Less Than 12 Months 700 2,756
12 Months or More 1,989 849
Total $ 2,689 $ 3,605
U.S. treasuries and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 7 12
Fair Value    
Less Than 12 Months $ 0 $ 133,221
12 Months or More 91,193 17,911
Total 91,193 151,132
Unrealized Losses    
Less Than 12 Months 0 2,211
12 Months or More 1,963 475
Total $ 1,963 $ 2,686
State and municipal    
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 19 3
Fair Value    
Less Than 12 Months $ 57,024 $ 7,227
12 Months or More 0 0
Total 57,024 7,227
Unrealized Losses    
Less Than 12 Months 616 37
12 Months or More 0 0
Total $ 616 $ 37
Mortgage-backed and asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 13 35
Fair Value    
Less Than 12 Months $ 28,862 $ 107,917
12 Months or More 7,030 76,867
Total 35,892 184,784
Unrealized Losses    
Less Than 12 Months 77 508
12 Months or More 26 374
Total $ 103 $ 882
Corporate debt    
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 2  
Fair Value    
Less Than 12 Months $ 3,005  
12 Months or More 0  
Total 3,005  
Unrealized Losses    
Less Than 12 Months 7  
12 Months or More 0  
Total $ 7