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Borrowings (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Short-term Debt    
Ending Balance $ 51,980 $ 50,000
Average Balance 50,469  
Maximum Month-End Balance $ 51,980  
Weighted Average Rate for the Year 0.57%  
Weighted Average Rate at End of Year 0.37%  
Other borrowings    
Short-term Debt    
Ending Balance $ 1,980  
Average Balance 469  
Maximum Month-End Balance $ 1,980  
Weighted Average Rate for the Year 0.07%  
Weighted Average Rate at End of Year 0.06%  
FHLB advances    
Short-term Debt    
Ending Balance $ 50,000 50,000
Average Balance 50,000 83,716
Maximum Month-End Balance $ 50,000 $ 179,199
Weighted Average Rate for the Year 0.57% 1.01%
Weighted Average Rate at End of Year 0.38% 0.40%