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Variable Interest Entities - Summary of Variable Interest Entities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Investment securities available-for-sale, at fair value $ 2,601,013 $ 4,273,864
Accrued expenses and other liabilities 206,023 203,962
Other assets 253,871 260,204
Assets 21,688,017 21,094,429
Liabilities 18,889,628 18,208,118
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Maximum Loss 168,216 200,769
Assets 132,743 167,097
Liabilities 15,762 17,567
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization    
Variable Interest Entity [Line Items]    
Investment securities available-for-sale, at fair value 56,784 81,103
Accrued expenses and other liabilities 334 338
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Asset    
Variable Interest Entity [Line Items]    
Maximum Loss 56,784 81,103
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Liability    
Variable Interest Entity [Line Items]    
Maximum Loss 50,901 50,901
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Partnership    
Variable Interest Entity [Line Items]    
Accrued expenses and other liabilities 15,428 17,229
Other assets 75,959 85,994
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Partnership, Asset    
Variable Interest Entity [Line Items]    
Maximum Loss 60,531 68,765
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Partnership, Liability    
Variable Interest Entity [Line Items]    
Maximum Loss $ 0 $ 0