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Allowance for Loan Losses - Impaired loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 542 $ 549
Recorded Investment with No Allowances 542 549
Total Recorded Investment 542 549
Average Recorded Investment 545 569
Interest Income Recognized 5 24
Real Estate Loans | Residential Real Estate    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 542 549
Recorded Investment with No Allowances 542 549
Total Recorded Investment 542 549
Average Recorded Investment 545 569
Interest Income Recognized $ 5 $ 24