Offsetting of Assets and Liabilities (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Offsetting Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value	$ 68,770,000	$ 6,638,000
Financial derivatives–liabilities, at fair value	(3,119,000)	(1,103,000)
Repurchase agreements	(842,455,000)	(1,064,835,000)
Derivative Liability, Fair Value, Amount Offset Against Collateral	(2,995,000)	(820,000)
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,995,000	820,000
Securities purchased under agreements to resell available for offset	499,000	31,306,000
Derivative, Collateral, Obligation to Return Cash	(41,453,000)	0
Derivative, Collateral, Right to Reclaim Cash	0	271,000
Cash Collateral Pledged	10,271,000	77,687,000
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election	24,322,000	5,818,000
Derivatives and related collateral, net	(124,000)	(12,000)
Repurchase agreements and related collateral, net	0	0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	882,000,000	1,000,000,000
Reverse repurchase agreements	499,000	117,505,000
Securities sold under agreements to repurchase available for offset	(499,000)	(31,306,000)
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash	0	0
Reverse Repurchase Agreements and Related Collateral Net	0	0
Derivative Financial Instruments, Assets [Member]
Offsetting Assets and Liabilities [Line Items]
Excess cash collateral	4,300,000	9,200,000
Repurchase Agreements [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	(831,685,000)	(955,842,000)
Derivative Financial Instruments, Assets [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	0	0
Derivative Financial Instruments, Liabilities [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	0	0
Reverse Repurchase Agreements [Member]
Offsetting Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	$ 0	$ (86,199,000)