Borrowings - Notes payable (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument
Notes payable	$ 888,534	$ 988,563
Advances with FHLB with maturities ranging from 2022 Through 2029
Debt Instrument
FHLB advances	391,429	492,429
Unsecured senior debt | Fixed Rate with maturities on 2023 paying interest semiannually
Debt Instrument
Long Term Debt	298,793	297,842
Junior subordinated debt | Fixed Rate with maturities on 2034
Debt Instrument
Long Term Debt	$ 198,312	$ 198,292