Derivative Instruments (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		$ 112,182	$ 60,492
Derivative Asset, Amount Offset by Liabiilty		0	0
Derivative Assets	[1]	112,182	60,492
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		58,718	54,984
Derivative Liability, Amount Offset by Asset		0	0
Derivative Liabilities	[1]	58,718	54,984
Derivatives subject to master netting agreements
Derivative Asset, Fair Value, Gross Asset		112,028	60,270
Derivative Asset, Amount Offset by Liabiilty		0	0
Derivative Asset, Net Amount Presented in the Balance Sheet		112,028	60,270
Derivative Asset, Not Offset, Policy Election Deduction		(93)	(1,007)
Derivatve asset, fair value of collateral		(111,060)	(56,816)
Derivative Asset, Fair Value, Amount Offset Against Collateral		875	2,447
Derivative Liability, Fair Value, Gross Liability		58,491	54,609
Derivative Liability, Amount Offset by Asset		0	0
Derivative Liability, Net Amount Presented in the Balance Sheet		58,491	54,609
Derivative Liability, Not Offset, Policy Election Deduction		(93)	(1,007)
Derivative Liability, Fair Value of Collateral		0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral		58,398	53,602
Derivatives not subject to master netting agreements
Derivative Asset, Fair Value, Gross Asset		154	222
Derivative Asset, Amount Offset by Liabiilty		0	0
Derivative Asset, Not Subject to Master Netting Arrangement		154	222
Derivative Liability, Fair Value, Gross Liability		227	375
Derivative Liability, Amount Offset by Asset		0	0
Derivative Liability, Not Subject to Master Netting Arrangement		$ 227	$ 375

[1] * The fair value of each class of derivative is shown in Note 11.