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Investments: Schedule of Available for sale Securities, Debt Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investments [Abstract]    
Due within one year, Amortized Cost $ 496  
Due after one year through five years, Amortized Cost 6,597  
Due after five years through ten years, Amortized Cost 18,664  
Due after ten years, Amortized Cost 57,090  
Debt maturities, Amortized Cost 82,847  
Mortgage-backed investments, Amortized Cost 54,447  
Amortized Cost 137,294 $ 145,216
Due within one year, Fair Value 498  
Due after one year through five years, Fair Value 6,738  
Due after five years through ten years, Fair Value 18,613  
Due after ten years, Fair Value 56,333  
Debt maturities, Fair Value 82,182  
Mortgage-backed investments, Fair Value 54,419  
Fair Value $ 136,601