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Variable Interest Entities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Variable Interest Entities    
Liabilities for VIEs $ 16,046,108 $ 15,251,432
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entities    
Investments in VIEs 130,672 151,962
Bridge loans to VIEs 442,195 318,823
Securities for VIEs 1,163,191 1,192,201
Maximum Exposure to Loss 1,736,058 1,662,986
Liabilities for VIEs 34,923 37,851
Low-income housing tax credit investments | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entities    
Investments in VIEs 96,675 118,741
Bridge loans to VIEs 136,197 232,407
Maximum Exposure to Loss 232,872 351,148
Liabilities for VIEs 32,171 35,099
Debt funds | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entities    
Investments in VIEs 33,997 33,221
Bridge loans to VIEs 305,998 86,416
Maximum Exposure to Loss 339,995 119,637
Liabilities for VIEs 2,752 2,752
Off-balance-sheet REMIC trusts | Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entities    
Securities for VIEs 1,163,191 1,192,201
Maximum Exposure to Loss $ 1,163,191 $ 1,192,201