Variable Interest Entities - Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
AFS investment securities	$ 1,320,050	$ 1,140,071
Accrued expenses and other liabilities	248,747	216,596
Other assets	350,931	368,996
Assets	18,332,325	19,026,645
Liabilities	15,408,561	16,144,064
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum Loss	140,019	153,214
Assets	126,118	137,289
Liabilities	30,683	32,415
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Asset
Variable Interest Entity [Line Items]
Maximum Loss	44,233	48,204
AFS investment securities	44,233	48,204
Variable Interest Entity, Not Primary Beneficiary | Multifamily Loan Securitization, Liability
Variable Interest Entity [Line Items]
Maximum Loss	44,239	47,994
Accrued expenses and other liabilities	345	345
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Partnership, Asset
Variable Interest Entity [Line Items]
Maximum Loss	51,547	57,016
Other assets	81,885	89,085
Variable Interest Entity, Not Primary Beneficiary | Affordable Housing Partnership, Liability
Variable Interest Entity [Line Items]
Maximum Loss	0	0
Accrued expenses and other liabilities	$ 30,338	$ 32,070