XML 58 R47.htm IDEA: XBRL DOCUMENT v3.21.1
INVESTMENTS - Gross Unrealized Losses and Fair Value by Length of Time of Available-For-Sale Securities (Detail)
$ in Thousands
Mar. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 90 34
Fair Value    
Less Than 12 Months $ 493,737 $ 92,868
12 Months or More 4,968 76,879
Total 498,705 169,747
Unrealized Losses    
Less Than 12 Months 15,220 367
12 Months or More 9 693
Total $ 15,229 $ 1,060
U.S. treasuries and government agencies    
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 1 2
Fair Value    
Less Than 12 Months $ 4,972 $ 25,369
12 Months or More 0 0
Total 4,972 25,369
Unrealized Losses    
Less Than 12 Months 2 2
12 Months or More 0 0
Total $ 2 $ 2
State and municipal    
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 43 8
Fair Value    
Less Than 12 Months $ 115,530 $ 22,753
12 Months or More 0 0
Total 115,530 22,753
Unrealized Losses    
Less Than 12 Months 4,709 211
12 Months or More 0 0
Total $ 4,709 $ 211
Mortgage-backed and asset-backed    
Debt Securities, Available-for-sale [Line Items]    
Number of Securities | security 46 24
Fair Value    
Less Than 12 Months $ 373,235 $ 44,746
12 Months or More 4,968 76,879
Total 378,203 121,625
Unrealized Losses    
Less Than 12 Months 10,509 154
12 Months or More 9 693
Total $ 10,518 $ 847