Investments (Unrealized Losses) (Details) $ in Thousands	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt security maturities rated investment grade, percent	98.60%	98.00%
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 72
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	0	2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 64	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 10	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	2	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 64	$ 72
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 10	$ 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	2	2
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 224
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 202,975	$ 21,715
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 35,836	$ 692
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	255	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 627	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 386	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	2	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 203,602	$ 21,715
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 36,222	$ 692
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	257	15
Corporate Debt Securities Financial Sector Member [Domain]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 185,874	$ 8,059
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 45,602	$ 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	253	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 778	$ 1,227
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 529	$ 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 186,652	$ 9,286
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 46,131	$ 172
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	254	16
Corporate Debt Security Consumer Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 178,490	$ 29,494
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 46,447	$ 777
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	240	28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 6,355	$ 2,419
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 3,954	$ 123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	10	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 184,845	$ 31,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 50,401	$ 900
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	250	29
Corporate Debt Security Utilities Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 84,016	$ 19,072
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 22,774	$ 401
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	162	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 4,557	$ 4,523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,869	$ 400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	6	4
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 88,573	$ 23,595
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 25,643	$ 801
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	168	18
Corporate Debt Security Energy Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 62,798	$ 7,381
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 13,377	$ 68
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	83	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 62,798	$ 7,381
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 13,377	$ 68
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	83	8
Corporate Debt Security All Other Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 142,448	$ 14,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 31,285	$ 380
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	183	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 2,799	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,452	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	2	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 145,247	$ 14,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 32,737	$ 380
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	185	16
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 49
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 49
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 100,546	$ 1,084
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 9,807	$ 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	100	6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	0	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 100,546	$ 1,084
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 9,807	$ 6
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	100	6
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 34,177	$ 9,078
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,732	$ 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	41	11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 2,655	$ 663
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 252	$ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	6	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 36,832	$ 9,741
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,984	$ 14
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	47	12
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 991,597	$ 110,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 207,860	$ 2,423
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1,319	115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 17,835	$ 8,832
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9,452	$ 611
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	29	7
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,009,432	$ 119,099
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 217,312	$ 3,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,348	122