Fair Value Measures and Disclosures (Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 169,876	$ 143,084
Unrealized Gains	180	1,523
Unrealized Losses	(10,272)	(1,396)
Fair Value	159,784	143,211
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	88,007	83,656
Less than 12 months, unrealized losses	(3,199)	(1,308)
12 Months or greater, fair value	67,173	2,652
12 Months or greater, unrealized losses	(7,073)	(88)
Total, fair value	155,180	86,308
Total, unrealized losses	(10,272)	(1,396)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Amortized cost, due within one year	20,301
Fair value, due within one year	20,113
Amortized cost, due after one year through five years	138,683
Fair value, due after one year through five years	130,365
Amortized cost, due after five years	10,892
Fair value, due after five years	9,306
Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	98,090	84,011
Unrealized Gains	14	999
Unrealized Losses	(6,548)	(655)
Fair Value	91,556	84,355
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	53,454	37,170
Less than 12 months, unrealized losses	(2,356)	(572)
12 Months or greater, fair value	34,782	1,938
12 Months or greater, unrealized losses	(4,192)	(83)
Total, fair value	88,236	39,108
Total, unrealized losses	(6,548)	(655)
Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	71,786	59,073
Unrealized Gains	166	524
Unrealized Losses	(3,724)	(741)
Fair Value	68,228	58,856
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	34,553	46,486
Less than 12 months, unrealized losses	(843)	(736)
12 Months or greater, fair value	32,391	714
12 Months or greater, unrealized losses	(2,881)	(5)
Total, fair value	66,944	47,200
Total, unrealized losses	(3,724)	(741)
Corporate debt securities | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	53,452	46,649
Unrealized Gains	1	438
Unrealized Losses	(3,550)	(438)
Fair Value	49,903	46,649
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	23,559	28,639
Less than 12 months, unrealized losses	(733)	(434)
12 Months or greater, fair value	25,842	207
12 Months or greater, unrealized losses	(2,817)	(4)
Total, fair value	49,401	28,846
Total, unrealized losses	(3,550)	(438)
Corporate debt securities | Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	70,968	58,261
Unrealized Gains	1	72
Unrealized Losses	(3,724)	(741)
Fair Value	67,245	57,592
U.S. government agency securities | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	34,920	28,316
Unrealized Gains	13	459
Unrealized Losses	(1,688)	(133)
Fair Value	33,245	28,642
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	24,834	5,382
Less than 12 months, unrealized losses	(939)	(97)
12 Months or greater, fair value	5,593	824
12 Months or greater, unrealized losses	(749)	(36)
Total, fair value	30,427	6,206
Total, unrealized losses	(1,688)	(133)
Municipal bonds | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	9,211	8,475
Unrealized Gains	0	100
Unrealized Losses	(1,257)	(78)
Fair Value	7,954	8,497
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	4,998	2,714
Less than 12 months, unrealized losses	(672)	(35)
12 Months or greater, fair value	2,956	907
12 Months or greater, unrealized losses	(585)	(43)
Total, fair value	7,954	3,621
Total, unrealized losses	(1,257)	(78)
Municipal bonds | Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	818	812
Unrealized Gains	165	452
Unrealized Losses	0	0
Fair Value	983	1,264
Corporate certificates of deposit | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	507	571
Unrealized Gains	0	2
Unrealized Losses	(53)	(6)
Fair Value	454	567
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	63	435
Less than 12 months, unrealized losses	(12)	(6)
12 Months or greater, fair value	391	0
12 Months or greater, unrealized losses	(41)	0
Total, fair value	454	435
Total, unrealized losses	$ (53)	$ (6)