Investments: Schedule of Available for sale Securities in Continuous Unrealized Loss positions (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 28,858	$ 26,495
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	360	143
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	57,572	77,641
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,420	3,475
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	86,430	104,136
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1,780	3,618
Mortgage-backed investments, Fannie Mae
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	8,340	5,480
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	104	32
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	16,721
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	625
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	8,340	22,201
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	104	657
Mortgage-backed investments, Freddie Mac
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	0	1,994
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	23
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	3,185
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	51
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	5,179
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	74
Mortgage backed investments Ginnie Mae
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	156	2,867
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	12,921	19,194
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	329	1,242
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	13,077	22,061
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	329	1,250
Other
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	2,843	6,008
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	21
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6,000	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	18	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	8,843	6,008
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	25	21
Municipal Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,257	4,161
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	36	46
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	934
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	74
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,257	5,095
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	36	120
US Government agencies
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	12,266	5,985
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	201	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	31,490	30,779
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	734	812
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	43,756	36,764
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	935	825
Corporate Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	1,996	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	12	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	7,161	6,828
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	339	671
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	9,157	6,828
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 351	$ 671