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Borrowings - Long-term Debt (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Mar. 31, 2022
Dec. 31, 2021
Long-term debt        
Long-term debt     $ 42,881 $ 46,056
FHLB advances        
Long-term debt        
Notes payable original maturity term 5 years 5 years    
Interest rate (as a percent)     3.04% 3.04%
Notes payable, FHLB, original maturity of 5 years, collateralized by FHLB deposits, residential and commercial real estate loans and FHLB stock        
Long-term debt        
Long-term debt     $ 3,881 $ 4,056
Term Loan        
Long-term debt        
Long-term debt     $ 39,000 $ 42,000