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Fair Value of Financial Instruments (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Gains or losses included in earnings attributable to the change in realized/unrealized gains or losses related to the assets | $ 0 | $ 0 |  |
Fair value, assets, level 1 to level 2 transfers, amount | 0 | 0 |  |
Fair value, assets, level 2 to level 1 transfer, amount | 0 | 0 |  |
Provision/(credit) for loan losses | (419,000) | 110,000 |  |
Nonaccrual loans | 2,332,000 |  | $ 2,462,000 |
Allowance for loan losses | (15,292,000) | $ (16,554,000) | (15,955,000) | $ (16,486,000)
Loans | 1,181,401,000 |  | 1,153,687,000 |
Impaired Loans with Specific Allowance: Recorded Investment | 374,000 |  | 480,000 |
Impaired Loans with Specific Allowance: Related Allowance | 35,000 |  | 64,000 |
Impaired Loans with No Specific Allowance: Recorded Investment | 5,157,000 |  | 5,248,000 |
Partial Charge Off [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Nonaccrual loans | 600,000 |  | 500,000 |
Troubled Debt Restructuring [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Provision/(credit) for loan losses | 1,300,000 |  | 1,300,000 |
Allowance for loan losses | (100,000) |  | (400,000) |
Impaired Loans with Specific Allowance: Recorded Investment | 800,000 |  | 1,000,000.0 |
Impaired Loans with Specific Allowance: Related Allowance | $ 35,500 |  | $ 64,700 |

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