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Offsetting of Assets and Liabilities (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Offsetting Assets and Liabilities [Line Items]    
Financial derivatives–assets, at fair value $ 70,518,000 $ 68,770,000
Financial derivatives–liabilities, at fair value (2,481,000) (3,119,000)
Repurchase agreements (875,030,000) (842,455,000)
Derivative Liability, Fair Value, Amount Offset Against Collateral (1,684,000) (2,995,000)
Derivative Asset, Fair Value, Amount Offset Against Collateral 1,684,000 2,995,000
Securities purchased under agreements to resell available for offset 10,130,000 499,000
Derivative, Collateral, Obligation to Return Cash (68,516,000) (41,453,000)
Derivative, Collateral, Right to Reclaim Cash 796,000 0
Cash Collateral Pledged 11,744,000 10,271,000
Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election 318,000 24,322,000
Derivatives and related collateral, net (1,000) (124,000)
Repurchase agreements and related collateral, net 0 0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 900,000,000 882,000,000
Reverse repurchase agreements 12,191,000 499,000
Securities sold under agreements to repurchase available for offset (10,130,000) (499,000)
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, Liabilities [Member]    
Offsetting Assets and Liabilities [Line Items]    
Excess cash collateral 6,000,000  
Derivative Financial Instruments, Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Excess cash collateral (14,500,000) 4,300,000
Repurchase Agreements [Member]    
Offsetting Assets and Liabilities [Line Items]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 853,156,000  
Financial Instruments Owned and Pledged as Collateral [Table]   831,685,000
Derivative Financial Instruments, Assets [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative Asset, Fair Value of Collateral 0 0
Derivative Financial Instruments, Liabilities [Member]    
Offsetting Assets and Liabilities [Line Items]    
Derivative Liability, Fair Value of Collateral 0 0
Reverse Repurchase Agreements [Member]    
Offsetting Assets and Liabilities [Line Items]    
Financial Instruments Owned and Pledged as Collateral [Table] $ (2,061,000) $ 0