Borrowings - Short-term Borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance outstanding at year end	$ 58,223,000	$ 36,592,000
Maximum balance at any month end during the year	145,579,000	38,051,000
Average balance for the year	$ 96,882,000	$ 35,630,000
Weighted average rate for the year (as a percent)	3.79%	0.51%
Weighted average rate on borrowings at year end	3.00%	0.97%
Estimated fair value at year end	$ 55,732,000	$ 33,616,000
Customers
Balance outstanding at year end	30,710,000	34,480,000
Federal Reserve Bank
Balance outstanding at year end	27,500,000	$ 2,110,000
Overnight borrowings | Federal Reserve Bank
Balance outstanding at year end	$ 18,000