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Fair Value Measurements (Available for Sale) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost $ 233,488 $ 222,134
Unrealized Gains 2,898 1,272
Unrealized Losses (3,060) (6,158)
Fair Value 233,326 217,248
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 3,559 17,748
Less than 12 Months, Unrealized Losses (63) (64)
12 Months or Greater, Fair Value 88,611 120,731
12 Months or Greater, Unrealized Losses (2,997) (6,094)
Total, Fair Value 92,170 138,479
Total, Unrealized Losses (3,060) (6,158)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]    
Amortized Cost, Due within one year 73,458  
Fair Value, Due within one year 72,601  
Amortized Cost, Due after one year through five years 149,868  
Fair Value, Due after one year through five years 151,220  
Amortized Cost, Due after five years 10,162  
Fair Value, Due after five years 9,505  
Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 135,926 133,710
Unrealized Gains 1,959 785
Unrealized Losses (2,392) (4,208)
Fair Value 135,493 130,287
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 1,051 6,350
Less than 12 Months, Unrealized Losses (33) (9)
12 Months or Greater, Fair Value 49,672 71,005
12 Months or Greater, Unrealized Losses (2,359) (4,199)
Total, Fair Value 50,723 77,355
Total, Unrealized Losses (2,392) (4,208)
Investments in lieu of retention:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 97,562 88,424
Unrealized Gains 939 487
Unrealized Losses (668) (1,950)
Fair Value 97,833 86,961
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 2,508 11,398
Less than 12 Months, Unrealized Losses (30) (55)
12 Months or Greater, Fair Value 38,939 49,726
12 Months or Greater, Unrealized Losses (638) (1,895)
Total, Fair Value 41,447 61,124
Total, Unrealized Losses (668) (1,950)
Corporate debt securities | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 111,009 95,903
Unrealized Gains 1,881 762
Unrealized Losses (1,132) (2,202)
Fair Value 111,758 94,463
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 742 4,971
Less than 12 Months, Unrealized Losses 0 (3)
12 Months or Greater, Fair Value 31,397 40,649
12 Months or Greater, Unrealized Losses (1,132) (2,199)
Total, Fair Value 32,139 45,620
Total, Unrealized Losses (1,132) (2,202)
Corporate debt securities | Investments in lieu of retention:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 96,733 87,601
Unrealized Gains 712 246
Unrealized Losses (668) (1,950)
Fair Value 96,777 85,897
U.S. government agency securities | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 17,946 29,082
Unrealized Gains 71 18
Unrealized Losses (602) (1,054)
Fair Value 17,415 28,046
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 309 1,280
Less than 12 Months, Unrealized Losses (33) (4)
12 Months or Greater, Fair Value 12,202 22,858
12 Months or Greater, Unrealized Losses (569) (1,050)
Total, Fair Value 12,511 24,138
Total, Unrealized Losses (602) (1,054)
Municipal bonds | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 6,630 8,227
Unrealized Gains 7 5
Unrealized Losses (641) (914)
Fair Value 5,996 7,318
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 0 99
Less than 12 Months, Unrealized Losses 0 (2)
12 Months or Greater, Fair Value 5,749 7,038
12 Months or Greater, Unrealized Losses (641) (912)
Total, Fair Value 5,749 7,137
Total, Unrealized Losses (641) (914)
Municipal bonds | Investments in lieu of retention:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 829 823
Unrealized Gains 227 241
Unrealized Losses 0 0
Fair Value 1,056 1,064
Corporate certificates of deposit | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 341 498
Unrealized Gains 0 0
Unrealized Losses (17) (38)
Fair Value 324 460
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or Greater, Fair Value 324 460
12 Months or Greater, Unrealized Losses (17) (38)
Total, Fair Value 324 460
Total, Unrealized Losses $ (17) $ (38)