Borrowings - Schedule of borrowed funds (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Balance	$ 1,528,695	$ 1,127,047
Weighted Average Interest Rate	4.94%	4.36%
FHLB advances
Debt Instrument [Line Items]
Balance	$ 1,521,733	$ 1,090,159
Weighted Average Interest Rate	4.92%	4.37%
Notes payable
Debt Instrument [Line Items]
Balance	$ 0	$ 29,894
Weighted Average Interest Rate	0.00%	3.35%	3.35%
Junior subordinated debentures
Debt Instrument [Line Items]
Balance	$ 6,962	$ 6,994
Weighted Average Interest Rate	8.59%	7.69%