Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure Abstract
Accrued expenses	$ 280,831	$ 235,449
Accrued interest payable	28,140	38,622
Accounts payable	67,401	69,784
Dividends payable	36,305	33,701
Trades payable	13,746	720,212
Liability for GNMA loans sold with an option to repurchase	12,297	57,189
Reserves for loan indemnifications	14,650	24,781
Reserve for operational losses	44,941	41,452
Operating lease liabilities	152,039	152,588
Finance lease liabilities	20,310	22,572
Pension benefit obligation	18,427	35,568
Postretirement benefit obligation	177,712	179,211
Other liabilities	62,419	73,560
Total other liabilities	$ 929,218	$ 1,684,689