Fair Values of Financial Instruments: Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) |
Dec. 31, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
|
|---|---|---|
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||
| Mortgage-servicing rights | $ 1,712,138 | $ 1,033,217 |
| Level 3 | ||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||
| Collateral-dependent impaired loans | 532,000 | 57,000 |
| Mortgage-servicing rights | $ 1,712,000 | $ 1,033,000 |
| Level 3 | Discount rate | Discounted cash flow | ||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||
| Mortgage servicing rights, measurement input | 0.10 | 0.10 |
| Minimum | Level 3 | Marketability discount | Appraisal | ||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||
| Collateral-dependent impaired loans, measurement input | 0 | 0 |
| Maximum | Level 3 | Marketability discount | Appraisal | ||
| Fair Value, Option, Quantitative Disclosures [Line Items] | ||
| Collateral-dependent impaired loans, measurement input | 0.12 | 0.75 |