Fair Value: Schedule of quantitative information about Level 3 Fair Value Measurements on a nonrecurring basis (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Other Real Estate	$ 454,000	$ 483,000	$ 483,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Obligations, Fair Value Disclosure, Brokered	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Obligations, Fair Value Disclosure, Brokered	94,556,000	97,466,000
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Obligations, Fair Value Disclosure, Brokered	0	0
Impaired Financing Receivable, Recorded Investment	19,939,000	10,087,000
Other Real Estate	454,000	483,000
Impaired Loans Receivable and other real estate owned Fair Value Measurement	$ 20,393,000	$ 10,570,000
Level 3 | Market Approach Valuation Technique | Loans Receivable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Unobservable Input(s)	Appraised value discounted by market or borrower conditions	Appraised value discounted by market or borrower conditions
Level 3 | Market Approach Valuation Technique | Loans Receivable | Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair value of financial instruments, range	0.00%	0.00%
Level 3 | Market Approach Valuation Technique | Loans Receivable | Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair value of financial instruments, range	0.00%	0.00%
Level 3 | Market Approach Valuation Technique | Loans Receivable | Weighted Average
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair value of financial instruments, range	0.00%	0.00%
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Unobservable Input(s)	Appraised value less selling costs	Appraised value less selling costs
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned | Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair value of financial instruments, range	0.00%	0.00%
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned | Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair value of financial instruments, range	0.00%	0.00%
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned | Weighted Average
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Fair value of financial instruments, range	0.00%	0.00%
Fair Value, Nonrecurring [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Impaired Financing Receivable, Related Allowance	$ 31,000	$ 62,000
Impaired Financing Receivable, Recorded Investment	19,939,000	10,087,000
Other Real Estate	454,000	483,000
Impaired Loans Receivable and other real estate owned Fair Value Measurement	20,393,000	10,570,000
Fair Value, Nonrecurring [Member] | Level 3 | Market Approach Valuation Technique | Loans Receivable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Financial and Nonfinancial Liabilities, Fair Value Disclosure	19,939,000	10,087,000
Fair Value, Nonrecurring [Member] | Level 3 | Market Approach Valuation Technique | Other Real Estate Owned
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 454,000	$ 483,000