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