Supplemental disclosure on the consolidated statments of cash flows - Non-cash activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flow Noncash Investing And Financing Activities Disclosure Abstract
Loans transferred to other real estate	$ 2,900	$ 16,986
Loans transferred to other property	13,029	14,232
Total loans transferred to foreclosed assets	15,929	31,218
Loans transfered to other assets	1,156	1,681
Financed sales of other real estate assets	3,206	4,619
Financed sales of other foreclosed assets	9,417	10,823
Total financed sales of other foreclosed and real estate assets	12,623	15,442
Transfers from loans held-in-portfolio to loans held-for-sale	38,959	10,723
Transfers from loans held-for-sale to loans held-in-portfolio	1,136	0
Loans securitized into investment securities	188,268	84,221
Trades receivables from brokers and counterparties	70,965	5,280
Trades payable to brokers and counterparties	12,180	5,279
Recognition of mortgage servicing rights on securitizations or asset transfers	3,636	1,634
Loans booked under the GNMA buy-back option	7,393	30,211
Capitalization of lease right of use asset	$ 1,774	$ 4,536