Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets, Resale Agreements
Gross Amounts of Recognized Assets	$ 785,000	$ 792,192
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts of Assets Presented on the Consolidated Balance Sheet	785,000	792,192
Assets Purchased under Agreements to Resell Gross Amounts Not Offset [Abstract]
Collateral Received	(687,327)	(701,790)
Net Amount	97,673	90,402
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	0	300,000
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	0	300,000
Assets Sold under Agreements to Repurchase Gross Amounts Not Offset [Abstract]
Collateral Pledged	0	(300,000)
Net Amount	$ 0	$ 0