Borrowings - Maximum aggregate balance of federal funds purchased and repurchase agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Maximum aggregate balance outstanding at any month-end	$ 162,450	$ 92,101
Average montly aggregate balance outstanding	$ 107,305	$ 91,394
Weighted average interest rate for the year	2.15%	0.35%
Weighted average interest rate at December 31	4.23%	0.26%