Repurchase Agreements - Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, maturities	$ 2,057,361	$ 1,862,063
Within 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, maturities	667,429	505,446
Over 30 days to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, maturities	1,389,932	1,263,000
Over 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, maturities	$ 0	$ 93,617