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Loans and Allowance for Loan Losses - Summary of Major Classifications of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross |  | $ 601,693 | $ 584,384 |
Less allowance for loan losses |  | (8,806) | (8,559) | $ (6,361)
Total loans, net |  | 592,887 | 575,825 |
Commercial (Secured by Real Estate - Owner Occupied) |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross |  | 156,332 | 158,662 |
Less allowance for loan losses |  | (2,435) | (2,701) | (1,913)
Commercial (Secured by Real Estate - Non-owner Occupied) |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross |  | 119,461 | 104,042 |
Less allowance for loan losses |  | (2,220) | (1,980) | (1,171)
Commercial and Industrial |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross |  | 155,374 | 152,834 |
Paycheck Protection Program Loans |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross | [1] | 7,078 | 17,883 |
Less allowance for loan losses |  | 0 | 0 |
Construction, Land and Acquisition & Development |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross |  | 27,138 | 16,317 |
Less allowance for loan losses |  | (336) | (162) | (224)
Residential Mortgage 1-4 Family |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross |  | 56,448 | 63,065 |
Consumer Installment |  |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |  |
Total loans, gross |  | 79,862 | 71,580 |
Less allowance for loan losses |  | $ (1,098) | $ (969) | $ (719)
[1] | Includes PPP loans that are fully guaranteed by the SBA; thus no allowance for loan losses has been allocated to these loans.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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