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Fair Value Measurements (Available for Sale) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost $ 187,217 $ 169,876
Unrealized Gains 152 180
Unrealized Losses (9,639) (10,272)
Fair Value 177,730 159,784
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 57,186 88,007
Less than 12 Months, Unrealized Losses (946) (3,199)
12 Months or Greater, Fair Value 114,040 67,173
12 Months or Greater, Unrealized Losses (8,693) (7,073)
Total, Fair Value 171,226 155,180
Total, Unrealized Losses (9,639) (10,272)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]    
Amortized Cost, Due within one year 32,555  
Fair Value, Due within one year 32,007  
Amortized Cost, Due after one year through five years 142,227  
Fair Value, Due after one year through five years 134,927  
Amortized Cost, Due after five years 12,435  
Fair Value, Due after five years 10,796  
Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 104,877 98,090
Unrealized Gains 0 14
Unrealized Losses (6,516) (6,548)
Fair Value 98,361 91,556
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 28,680 53,454
Less than 12 Months, Unrealized Losses (587) (2,356)
12 Months or Greater, Fair Value 65,091 34,782
12 Months or Greater, Unrealized Losses (5,929) (4,192)
Total, Fair Value 93,771 88,236
Total, Unrealized Losses (6,516) (6,548)
Investments in lieu of retention:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 82,340 71,786
Unrealized Gains 152 166
Unrealized Losses (3,123) (3,724)
Fair Value 79,369 68,228
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 28,506 34,553
Less than 12 Months, Unrealized Losses (359) (843)
12 Months or Greater, Fair Value 48,949 32,391
12 Months or Greater, Unrealized Losses (2,764) (2,881)
Total, Fair Value 77,455 66,944
Total, Unrealized Losses (3,123) (3,724)
Corporate debt securities | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 66,046 53,452
Unrealized Gains 0 1
Unrealized Losses (3,638) (3,550)
Fair Value 62,408 49,903
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 20,382 23,559
Less than 12 Months, Unrealized Losses (495) (733)
12 Months or Greater, Fair Value 39,026 25,842
12 Months or Greater, Unrealized Losses (3,143) (2,817)
Total, Fair Value 59,408 49,401
Total, Unrealized Losses (3,638) (3,550)
Corporate debt securities | Investments in lieu of retention:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 81,518 70,968
Unrealized Gains 1 1
Unrealized Losses (3,123) (3,724)
Fair Value 78,396 67,245
U.S. government agency securities | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 29,724 34,920
Unrealized Gains 0 13
Unrealized Losses (1,599) (1,688)
Fair Value 28,125 33,245
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 8,112 24,834
Less than 12 Months, Unrealized Losses (89) (939)
12 Months or Greater, Fair Value 18,763 5,593
12 Months or Greater, Unrealized Losses (1,510) (749)
Total, Fair Value 26,875 30,427
Total, Unrealized Losses (1,599) (1,688)
Municipal bonds | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 8,607 9,211
Unrealized Gains 0 0
Unrealized Losses (1,230) (1,257)
Fair Value 7,377 7,954
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 186 4,998
Less than 12 Months, Unrealized Losses (3) (672)
12 Months or Greater, Fair Value 6,851 2,956
12 Months or Greater, Unrealized Losses (1,227) (585)
Total, Fair Value 7,037 7,954
Total, Unrealized Losses (1,230) (1,257)
Municipal bonds | Investments in lieu of retention:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 822 818
Unrealized Gains 151 165
Unrealized Losses 0 0
Fair Value 973 983
Corporate certificates of deposit | Restricted investments:    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amortized Cost 500 507
Unrealized Gains 0 0
Unrealized Losses (49) (53)
Fair Value 451 454
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Fair Value 0 63
Less than 12 Months, Unrealized Losses 0 (12)
12 Months or Greater, Fair Value 451 391
12 Months or Greater, Unrealized Losses (49) (41)
Total, Fair Value 451 454
Total, Unrealized Losses $ (49) $ (53)