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Borrowings - Short-term borrowings (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Short-term borrowings    
Short-term borrowings $ 17,678,000 $ 4,658,000
Federal funds purchased 0 0
FHLB advances    
Short-term borrowings    
Short-term borrowings 5,678,000 $ 4,658,000
Term Loan, current portion due within 12 months    
Short-term borrowings    
Short-term borrowings $ 12,000,000  
Minimum    
Short-term borrowings    
Short-term borrowings, mature period 1 day  
Maximum    
Short-term borrowings    
Short-term borrowings, mature period 90 days