Offsetting of Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financial derivatives–assets
Financial derivatives–assets, at fair value	$ 151,155	$ 184,395
Financial Instruments Available for Offset	(53,269)	(70,064)
Cash Collateral (Received) Pledged	(25,460)	(50,200)
Net Amount	72,426	64,131
Reverse repurchase agreements
Reverse repurchase agreements	365,716	336,743
Financial Instruments Available for Offset	(24,351)	(161,956)
Cash Collateral (Received) Pledged	0	0
Net Amount	0	0
Financial derivatives–liabilities
Financial derivatives–liabilities, at fair value-	(60,763)	(71,024)
Financial Instruments Available for Offset	53,269	70,064
Cash Collateral (Received) Pledged	7,380	956
Net Amount	(114)	(4)
Repurchase agreements
Reverse repurchase agreements	(2,800,964)	(2,584,040)
Financial Instruments Available for Offset	24,351	161,956
Securities Collateral relating to Reverse Repurchase Agreements	3,500,000	3,300,000
Cash Collateral (Received) Pledged	7,029	5,311
Net Amount	0	0
Financial Derivatives - Assets
Financial derivatives–assets
Derivative Asset, Fair Value of Collateral	0	0
Repurchase agreements
Excess cash collateral	7,600	4,000
Securities Purchased under Agreements to Resell [Member]
Reverse repurchase agreements
Securities Purchased under Agreements to Resell, Fair Value of Collateral	(341,365)	(174,787)
Financial Derivatives - Liabilities
Financial derivatives–liabilities
Derivative Liability, Fair Value of Collateral	0	0
Repurchase agreements
Excess cash collateral	10,400	(100)
Reverse repurchase agreements
Repurchase agreements
Securities Collateral relating to Reverse Repurchase Agreements	$ 2,769,584	$ 2,416,773