Borrowings - Notes payable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Notes payable	$ 986,948	$ 886,710
Advances with FHLB with maturities ranging from 2024 Through 2029
Debt Instrument [Line Items]
FHLB advances	394,665	389,282
Unsecured senior debt | Fixed Rate maturing on 2028 paying interest semiannually
Debt Instrument [Line Items]
Notes payable	393,937	299,109
Junior subordinated debt | Fixed Rate maturing on 2034
Debt Instrument [Line Items]
Notes payable	$ 198,346	$ 198,319