Loans, net and allowance for credit losses - Net Deferred Loan Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Net deferred loan costs	$ 1,100	$ 400
Net loans	3,951,729	$ 2,828,002
Federal Home Loan Bank (FHLB)
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits	1,700,000
Federal Reserve Bank Advances
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits	476,000
Assets pledged as collateral | Federal Home Loan Bank (FHLB)
Net loans	2,400,000
Assets pledged as collateral | Federal Reserve Bank Advances
Net loans	$ 624,800