Investments: Schedule of Available for sale Securities, Debt Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investments [Abstract]
Due within one year, Amortized Cost	$ 0
Due after one year through five years, Amortized Cost	9,845
Due after five years through ten years, Amortized Cost	16,349
Due after ten years, Amortized Cost	13,144
Debt maturities, Amortized Cost	39,338
Mortgage-backed investments, Amortized Cost	90,101
Amortized Cost	129,439	$ 119,140
Due within one year, Fair Value	0
Due after one year through five years, Fair Value	9,802
Due after five years through ten years, Fair Value	16,222
Due after ten years, Fair Value	13,351
Debt maturities, Fair Value	39,375
Mortgage-backed investments, Fair Value	90,190
Fair Value	$ 129,565