Fair Value: Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure $ 129,260,000 $ 129,565,000
Derivative Asset, Fair Value, Gross Asset 1,333,000 0
Assets, Fair Value Disclosure, Recurring 130,593,000  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure   129,565,000
Derivative Asset, Fair Value, Gross Asset 1,333  
Assets, Fair Value Disclosure, Recurring 130,593,000  
Mortgage-backed investments, Fannie Mae    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 41,332,000 50,321,000
Mortgage-backed investments, Fannie Mae | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 41,332,000 50,321,000
Mortgage-backed investments, Freddie Mac    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 18,009,000 26,137,000
Mortgage-backed investments, Freddie Mac | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 18,009,000 26,137,000
Mortgage-backed investments, Ginnie Mae    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 18,634,000 13,732,000
Mortgage-backed investments, Ginnie Mae | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 18,634,000 13,732,000
Municipal Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 13,107,000 12,064,000
Municipal Bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 13,107,000 12,064,000
US Government agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 15,857,000 13,542,000
US Government agencies | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 15,857,000 13,542,000
Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure 22,321,000 13,769,000
Corporate Bonds | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, fair value disclosure $ 22,321,000 $ 13,769,000