Discontinued operations - Balance Sheet Data (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 750,535	$ 244,091	$ 43,728
Investment securities
Total assets	8,931,416	17,243,821
Liabilities and shareholder’s equity
Total liabilities	$ 7,418,034	14,864,687
Discontinued Operations, Disposed of by Sale
Assets
Cash and due from banks		184,383
Interest-bearing deposits		251,072
Cash and cash equivalents		435,455
Investment securities
Available-for-sale investment securities		1,136,439
Held-to-maturity investment securities, at amortized cost		1,201,314
Stock in Federal Home Loan Bank, at cost		14,728
Loans held for investment		6,180,810
Allowance for credit losses		(74,372)
Total loans, net		6,106,438
Loans held for sale, at lower of cost or fair value		15,168
Other		681,460
Goodwill		82,190
Total assets		9,673,192
Liabilities and shareholder’s equity
Deposit liabilities–noninterest-bearing		2,599,762
Deposit liabilities–interest-bearing		5,546,016
Other borrowings		750,000
Other		247,563
Total liabilities		$ 9,143,341