Borrowings - Maximum aggregate balance of federal funds purchased and repurchase agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
Maximum aggregate balance outstanding at any month-end	$ 105,684	$ 150,692
Average montly aggregate balance outstanding	$ 76,156	$ 115,808
Weighted average interest rate for the year	5.54%	5.20%
Weighted average interest rate at December 31	4.99%	5.68%