Loans Receivable and Allowance for Loan Losses - Schedule of Summarized Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 10,261,645	$ 9,593,879
Premiums on purchased loans	1,380	1,451
Net deferred fees	(14,142)	(13,706)
Loans	10,248,883	9,581,624
Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	7,723,195	7,077,571
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	2,233,670	2,188,866
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	304,780	327,442
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,177,698	1,202,638
Residential | Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,177,698	1,202,638
Loans	10,248,883	9,581,624
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	4,316,185	3,827,370
Commercial | Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	4,316,185	3,827,370
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,513,818	1,364,397
Multi-family | Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	1,513,818	1,364,397
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	715,494	683,166
Construction | Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross loans	$ 715,494	$ 683,166