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Short-term borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-term Debt      
Ending Balance   $ 50,000  
FHLB Advances      
Short-term Debt      
Ending Balance   50,000 $ 152,150
Average Balance $ 13,973 83,716 62,941
Maximum Month-End Balance $ 50,000 $ 179,199 $ 152,150
Weighted Average Rate for the Year 0.56% 1.01% 2.61%
Weighted Average Rate at End of Year   0.40% 1.84%