Investments (Unrealized Losses) (Details) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt security maturities rated investment grade, percent	97.60%	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	$ 66	$ 72
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 7	$ 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	2	2
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	$ 66	$ 72
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 7	$ 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	2	2
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	$ 149,297	$ 21,715
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 21,429	$ 692
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	171	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 720	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 294	$ 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	$ 150,017	$ 21,715
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 21,723	$ 692
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	173	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	$ 181,314	$ 8,059
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 29,539	$ 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	218	15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 887	$ 1,227
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 422	$ 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	$ 182,201	$ 9,286
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 29,961	$ 172
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	219	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	$ 175,856	$ 29,494
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 30,776	$ 777
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	213	28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 2,842	$ 2,419
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,220	$ 123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	7	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 178,698	$ 31,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 31,996	$ 900
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	220	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	$ 83,987	$ 19,072
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 15,311	$ 401
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	132	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 4,986	$ 4,523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,343	$ 400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	5	4
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 88,973	$ 23,595
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 17,654	$ 801
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	137	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	$ 64,778	$ 7,381
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 8,884	$ 68
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	77	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	$ 64,778	$ 7,381
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 8,884	$ 68
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	77	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	$ 146,713	$ 14,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 21,215	$ 380
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	171	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 2,427	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 935	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1	0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 149,140	$ 14,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 22,150	$ 380
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	172	16
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	$ 82,801	$ 1,084
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,133	$ 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	72	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	$ 82,801	$ 1,084
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,133	$ 6
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	72	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	$ 30,469	$ 9,078
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,436	$ 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	35	11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 1,643	$ 663
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 77	$ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	2	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 32,112	$ 9,741
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,513	$ 14
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	37	12
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 915,281	$ 110,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 130,730	$ 2,423
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1,091	115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 13,505	$ 8,832
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 5,291	$ 611
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	18	7
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 928,786	$ 119,099
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 136,021	$ 3,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,109	122

Percent of debt security maturities rated investment grade level BBB and higher to total debt security maturities

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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