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Borrowings - Short-term Borrowings (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Balance outstanding at year end $ 28,994,000 $ 58,223,000
Maximum balance at any month end during the year 58,842,000 145,579,000
Average balance for the year $ 29,614,000 $ 96,882,000
Weighted average rate for the year (as a percent) 1.88% 3.79%
Weighted average rate on borrowings at year end 1.64% 3.00%
Estimated fair value at year end $ 28,993,000 $ 55,732,000
Customers    
Balance outstanding at year end $ 28,990,000 30,710,000
Federal Reserve Bank    
Balance outstanding at year end   27,500,000
Overnight borrowings | Federal Reserve Bank    
Balance outstanding at year end   $ 18,000