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Variable Interest Entities - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
AFS investment securities $ 2,112,852 $ 2,601,013
Accrued expenses and other liabilities 191,229 206,023
Other assets 257,082 253,871
Assets 21,361,564 21,688,017
Liabilities 18,530,403 18,889,628
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum Loss 158,967 168,216
Assets 123,280 132,743
Liabilities 15,548 15,762
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Asset    
Variable Interest Entity [Line Items]    
Maximum Loss 53,716 56,784
AFS investment securities 53,716 56,784
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Liability    
Variable Interest Entity [Line Items]    
Maximum Loss 50,901 50,901
Accrued expenses and other liabilities 334 334
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Partnership, Asset    
Variable Interest Entity [Line Items]    
Maximum Loss 54,350 60,531
Other assets 69,564 75,959
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Partnership, Liability    
Variable Interest Entity [Line Items]    
Maximum Loss 0 0
Accrued expenses and other liabilities $ 15,214 $ 15,428