Investments (Unrealized Losses) (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt security maturities rated investment grade, percent	98.70%	98.70%
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 514	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	2	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 66	$ 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 8	$ 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	2	2
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 580	$ 64
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 10	$ 9
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	4	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	$ 223	$ 223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1	1
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	$ 223	$ 223
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1	$ 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1	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	$ 111,550	$ 189,084
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 5,674	$ 30,866
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	131	242
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 80,193	$ 14,184
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 22,944	$ 7,098
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	100	14
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 191,743	$ 203,268
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 28,618	$ 37,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	231	256
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	$ 102,783	$ 182,447
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 9,440	$ 39,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	119	237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 89,543	$ 6,144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 26,679	$ 3,261
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	130	16
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 192,326	$ 188,591
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 36,119	$ 42,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	249	253
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	$ 81,680	$ 164,224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 5,352	$ 34,823
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	90	220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 108,995	$ 23,417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 33,162	$ 12,315
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	153	30
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 190,675	$ 187,641
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 38,514	$ 47,138
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	243	250
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	$ 30,814	$ 73,483
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,271	$ 15,959
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	55	152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 61,557	$ 16,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 17,933	$ 7,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	104	18
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 92,371	$ 89,896
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 20,204	$ 23,790
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	159	170
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	$ 36,270	$ 59,053
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,270	$ 9,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	41	75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 26,992	$ 5,617
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 6,570	$ 1,794
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	37	8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 63,262	$ 64,670
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 8,840	$ 11,395
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	78	83
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	$ 93,285	$ 140,955
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 6,463	$ 25,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	99	171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 57,461	$ 7,910
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 16,093	$ 3,711
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	80	15
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 150,746	$ 148,865
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 22,556	$ 29,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	179	186
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	$ 168	$ 168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 3	$ 2
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	$ 168	$ 168
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3	$ 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	2	2
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	$ 101,277	$ 98,758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 7,354	$ 10,514
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	87	95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 1,296	$ 759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 332	$ 251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	12	5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 102,573	$ 99,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 7,686	$ 10,765
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	99	100
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 12,725	$ 37,067
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 692	$ 2,485
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	19	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 23,609	$ 4,264
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,740	$ 282
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	28	9
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 36,334	$ 41,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,432	$ 2,767
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	47	50
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 571,289	$ 945,462
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 39,522	$ 168,710
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	646	1,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 449,712	$ 78,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 125,461	$ 36,552
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	646	117
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,021,001	$ 1,024,234
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 164,983	$ 205,262
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,292	1,353