Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Liabilities Disclosure Abstract
Accrued expenses	$ 246,177	$ 235,449
Accrued interest payable	30,124	38,622
Accounts payable	71,174	69,784
Dividends payable	33,754	33,701
Trades payable	12,180	720,212
Liability for GNMA loans sold with an option to repurchase	29,399	57,189
Reserves for loan indemnifications	22,422	24,781
Reserve for operational losses	44,144	41,452
Operating lease liabilities	140,129	152,588
Finance lease liabilities	21,439	22,572
Pension benefit obligation	29,854	35,568
Postretirement benefit obligation	178,666	179,211
Other liabilities	59,382	73,560
Total other liabilities	$ 918,844	$ 1,684,689