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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Accrued expenses and other liabilities $ 224,348 $ 243,207
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum Loss $ 217,194 223,509
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Liability    
Variable Interest Entity [Line Items]    
Maximum loss, percentage of loans 10.00%  
Maximum Loss $ 50,901 50,901
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization    
Variable Interest Entity [Line Items]    
Accrued expenses and other liabilities $ 448 $ 448