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Loans - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) forbearanceAgreement Contract application | Mar. 31, 2021 USD ($) Security | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Period for order of valuations (at least) | 18 months |  |  |
Troubled debt restructured loans, balance | $ 3,592,000 | $ 3,764,000 |  |
Number of loans which has periodic late payments | Contract | 1 |  |  |
Number of contracts with active forbearance agreements | forbearanceAgreement | 0 |  |  |
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process | $ 767,000 |  | $ 399,000 |
Recognized loan fee income | $ 16,090,000 | 17,798,000 |  |
Residential mortgage and commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Threshold period past due to discontinue accrual interest on financing receivable | 90 days |  |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Threshold period past due for write-off of financing receivable (no later than) | 120 days |  |  |
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Period of financing receivable, updated valuation on real estate secured loans (number of days past due) | 90 days |  |  |
Number of previous months with no updated valuation completed for corporation to update valuation | 12 months |  |  |
Impaired financing receivable, valuation on real estate collateralized loans (number of days after the loan is classified as impaired) | 30 days |  |  |
CARES Act |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructured loans, balance |  | $ 23,720,360 |  |
Number of applications | application | 2,217 |  |  |
Total amount under PPP (up to) | $ 223,036,703 |  |  |
Projected fee income | 9,500,000 |  |  |
Recognized loan fee income | 468,000 |  | $ 5,627,000 | $ 2,875,000
Number of Loans | Security |  | 30 |  |
Percent of loan portfolio |  | 0.016 |  |
PPP loans | $ 9,844,452 |  |  |
Maximum | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable term | 20 years |  |  |
Loan-to-value ratio (no greater than) | 80.00% |  |  |
Maximum | Residential mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable term | 30 years |  |  |
Loan-to-value ratio (no greater than) | 80.00% |  |  |
Loan-to-value ratio that requires private mortgage insurance (in excess of) | 80.00% |  |  |
Maximum | Home equity lines of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable term | 20 years |  |  |
Loan-to-value ratio (no greater than) | 90.00% |  |  |
Nonaccrual |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructured loans, balance | $ 47,000 | $ 111,000 |  |
Accrual |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructured loans, balance | $ 3,545,000 | $ 3,653,000 |  |

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