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Borrowings - Short-term Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Balance outstanding at year end $ 36,592 $ 34,735
Maximum balance at any month end during the year 38,051 38,197
Average balance for the year $ 35,630 $ 27,359
Weighted average rate for the year (as a percent) 0.51% 0.47%
Weighted average rate on borrowings at year end 0.97% 0.48%
Estimated fair value at year end $ 36,592 $ 34,735
Customers    
Balance outstanding at year end 34,500  
Overnight borrowings | Federal Reserve Bank    
Balance outstanding at year end $ 2,100