Borrowings - Notes payable (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Notes payable	$ 966,303	$ 986,948
Advances with FHLB with maturities ranging from 2024 Through 2029
Debt Instrument [Line Items]
FHLB advances	373,665	394,665
Unsecured senior debt | Fixed Rate maturing on 2028 paying interest semiannually
Debt Instrument [Line Items]
Long Term Debt	394,285	393,937
Junior subordinated debt | Fixed Rate maturing on 2034
Debt Instrument [Line Items]
Long Term Debt	$ 198,353	$ 198,346