v3.26.1
Assets Sold Under Agreements to Repurchase - Summary of Maturities of Outstanding Advances Under Repurchase Agreements by Maturity Date (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
USD ($)
Assets Sold under Agreements to Repurchase [Line Items]  
Maturity of repurchase agreements $ 7,304,211
Weighted average maturity (in months) 2 months 9 days
Within 30 days [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Maturity of repurchase agreements $ 4,209,428
Over 30 to 90 days [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Maturity of repurchase agreements 2,387,866
Over 90 days to 180 days [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Maturity of repurchase agreements 153,151
Over 180 Days to 1 Year [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Maturity of repurchase agreements 55,000
Over 1 year to 2 years [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Maturity of repurchase agreements $ 498,766