Loans Receivable and Allowance for Credit Losses - Summarized Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 18,765,069	$ 10,882,898
Premiums on purchased loans	1,410	1,474
Net deferred fees	(7,149)	(12,456)
Total loans	18,759,330	10,871,916
Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,337,742	4,512,411
Multi-family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,189,808	1,812,500
Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	970,244	653,246
Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	2,024,027	1,164,956
Mortgage loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	13,521,821	8,143,113
Mortgage loans \| Commercial
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	7,337,742	4,512,411
Mortgage loans \| Multi-family
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	3,189,808	1,812,500
Mortgage loans \| Construction
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	970,244	653,246
Mortgage loans \| Residential
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	2,024,027	1,164,956
Commercial loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	4,617,232	2,440,621
Consumer loans
Servicing Liability at Amortized Cost [Line Items]
Total gross loans	$ 626,016	$ 299,164

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

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Amount of unamortized loan commitment, origination, and other costs (fees) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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