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Federal Home Loan Bank and Federal Reserve Bank Borrowings - maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
FHLB Fixed Rate Advances, Maturities Summary [Abstract]    
Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due within One Year of Balance Sheet Date 3.85%  
FHLB Fixed Rate Advances, Weighted Average Interest Rate, Due after 10 years 5.37%  
Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate, under One Year $ 2,000  
FHLB Fixed Rate Advances, Due after 10 years 5,000  
FHLB Fixed Rate Advances, Total Amount before valuation adjustment 7,000 $ 7,000
Valuation adjustment from acquisition accounting 359  
FHLB Fixed Rate Advances, Total Amount $ 7,359