Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	$ 9,713,760	$ 9,086,045
Repurchase agreements	9,113,270	8,603,011
Available-for-sale securities
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	8,822,484	7,426,953
Mortgage servicing rights
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	503,611	667,238
Repurchase agreements	277,816	309,000
Mortgage servicing rights | Variable Funding Note
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	219,800	309,000
Mortgage servicing rights | Term notes payable
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	58,100
Restricted cash
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	343,092	77,429
Due from counterparties
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	34,942	22,055
Derivative assets
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	9,631	14,738
US Treasury Securities
Assets Sold under Agreements to Repurchase [Line Items]
Assets pledged or restricted as collateral for repurchase agreements	0	877,632
Repurchase agreements	$ 0	$ 888,295