Borrowings - Schedule of contractual maturity of borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total FHLB advances	$ 1,528,695	$ 1,127,047
Line of Credit and FHLB Advances
Debt Instrument [Line Items]
One year or less	906,995
After one year to two years	142,438
After two years to three years	187,102
After three years to four years	124,648
After four years	160,550
Total FHLB advances	$ 1,521,733