Derivatives - Offsetting of Derivatives (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Derivative assets
Derivative assets - Fair value	$ 765,161,000	$ 755,328,000
Less: Master netting agreements	(208,183,000)	(242,745,000)
Less: Cash collateral received	(264,245,000)	(372,038,000)
Net derivative assets	292,733,000	140,545,000
Less: Security Collateral Received	(258,757,000)	(60,567,000)
Net Amount	33,976,000	79,978,000
Contracts not subject to master netting arrangements, gross amounts recognized	287,000	2,100,000
Derivative, cash collateral received, including amount offset by fair value assets, and excess cash amount	(275,700,000)	(384,900,000)
Amount used to offset against derivative assets	(264,245,000)	(372,038,000)
Derivative liabilities
Gross amounts recognized	811,725,000	887,264,000
Less: Master netting agreements	(208,183,000)	(242,745,000)
Less: Cash collateral received	0	0
Net derivative liabilities	603,542,000	644,519,000
Less: Security Collateral Pledged	0	(38,438,000)
Net Amount	603,542,000	606,081,000
Contracts not subject to master netting arrangements, gross amounts recognized	12,000	566,000
Derivative, cash collateral posted against derivative liabilities, including amount offset the derivative fair value liabilities, and excess cash amount	0	490,000
Amount used to offset against derivative liabilities	$ 0	$ 0