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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Subordinated Borrowing [Line Items]          
Federal tax credits recognized in tax expense $ 950 $ 800 $ 2,860 $ 2,390  
Investment tax credits 4,680 1,340 19,020 12,130  
Investment carrying amount 9,056,691   9,056,691   $ 8,931,938
Unfunded capital and other commitments 7,765,260   7,765,260   7,750,432
Maximum exposure to loss, unconsolidated VIEs 78,029   78,029   74,242
Variable Interest Entity [Line Items]          
Investment carrying amount 9,056,691   9,056,691   8,931,938
Investment tax credits 4,680 $ 1,340 19,020 $ 12,130  
Variable interest entity, primary beneficiary          
Subordinated Borrowing [Line Items]          
Investment carrying amount 61,000   61,000   78,200
Unfunded capital and other commitments 0   0   0
Variable Interest Entity [Line Items]          
Investment carrying amount 61,000   61,000   78,200
Variable interest entity, not primary beneficiary          
Subordinated Borrowing [Line Items]          
Investment carrying amount 70,715   70,715   62,044
Unfunded capital and other commitments 65,976   65,976   52,806
Variable Interest Entity [Line Items]          
Investment carrying amount $ 70,715   $ 70,715   $ 62,044