Investments: Schedule of Available for sale Securities in Continuous Unrealized Loss positions (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value
Less Than 12 Months	$ 25,131	$ 115,259
12 Months or Longer	177,112	92,739
Total	202,243	207,998
Gross Unrealized Loss
Less Than 12 Months	(639)	(6,392)
12 Months or Longer	(21,242)	(11,798)
Total	(21,881)	(18,190)
Mortgage-backed investments, Fannie Mae
Fair Value
Less Than 12 Months	0	6,710
12 Months or Longer	9,431	3,226
Total	9,431	9,936
Gross Unrealized Loss
Less Than 12 Months	0	(1,073)
12 Months or Longer	(2,185)	(787)
Total	(2,185)	(1,860)
Mortgage-backed investments, Freddie Mac
Fair Value
Less Than 12 Months	673	4,677
12 Months or Longer	10,729	6,476
Total	11,402	11,153
Gross Unrealized Loss
Less Than 12 Months	(57)	(272)
12 Months or Longer	(2,159)	(1,559)
Total	(2,216)	(1,831)
Mortgage backed investments Ginnie Mae
Fair Value
Less Than 12 Months	11,547	7,645
12 Months or Longer	14,959	13,714
Total	26,506	21,359
Gross Unrealized Loss
Less Than 12 Months	(70)	(310)
12 Months or Longer	(1,723)	(1,291)
Total	(1,793)	(1,601)
Mortgage-backed investments, Other
Fair Value
Less Than 12 Months	2,376	27,430
12 Months or Longer	26,909	4,959
Total	29,285	32,389
Gross Unrealized Loss
Less Than 12 Months	(104)	(1,614)
12 Months or Longer	(2,065)	(292)
Total	(2,169)	(1,906)
Municipal bonds
Fair Value
Less Than 12 Months	4,748	7,892
12 Months or Longer	24,582	20,901
Total	29,330	28,793
Gross Unrealized Loss
Less Than 12 Months	(175)	(680)
12 Months or Longer	(7,166)	(5,422)
Total	(7,341)	(6,102)
U.S. Government agencies
Fair Value
Less Than 12 Months	20	43,664
12 Months or Longer	67,955	30,224
Total	67,975	73,888
Gross Unrealized Loss
Less Than 12 Months	0	(1,184)
12 Months or Longer	(1,491)	(1,186)
Total	(1,491)	(2,370)
Corporate bonds
Fair Value
Less Than 12 Months	5,767	17,241
12 Months or Longer	22,547	13,239
Total	28,314	30,480
Gross Unrealized Loss
Less Than 12 Months	(233)	(1,259)
12 Months or Longer	(4,453)	(1,261)
Total	$ (4,686)	$ (2,520)