Supplemental disclosure on the consolidated statments of cash flows - Non-cash activities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flow Noncash Investing And Financing Activities Disclosure Abstract
Loans transferred to other real estate	$ 40,278	$ 16,724
Loans transferred to other property	32,748	34,351
Total loans transferred to foreclosed assets	73,026	51,075
Loans transfered to other assets	5,237	5,763
Financed sales of other real estate assets	9,641	11,401
Financed sales of other foreclosed assets	31,809	24,188
Total financed sales of foreclosed assets	41,450	35,589
Financed sale of premises and equipment	30,730	31,350
Transfers from premises and equipment to long-lived assets held-for-sale	26,242	0
Transfers from loans held-in-portfolio to loans held-for-sale	60,806	65,229
Transfers from loans held-for-sale to loans held-in-portfolio	6,710	17,640
Loans securitized into investment securities	546,335	307,512
Trades receivables from brokers and counterparties	74,328	65,993
Trades payable to brokers and counterparties	13,746	1,484,410
Recognition of mortgage servicing rights on securitizations or asset transfers	9,888	6,006
Loans booked under the GNMA buy-back option	20,908	121,531
Capitalization of lease right of use asset	$ 26,676	$ 25,620