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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Detail) $ in Thousands	Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 5,764,401	$ 5,898,405
Allowance for loan losses	(79,353)	(81,030)
Loans receivable, net	5,685,048	5,817,375
Deferred loan costs/(fees) and premiums/(discounts), net	4,600	6,200
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(82,713)	(84,213)	$ (82,131)	$ (61,713)
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,878,325	2,088,308
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	839,965	807,195
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,258,278	1,289,820
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	338,903	273,444
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	169,122	176,016
Commercial | PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 276,000	$ 210,000
Number of loans | loan	1,228	949
Deferred loan costs/(fees) and premiums/(discounts), net	$ 5,100	$ (1,600)
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,253,251	1,230,236
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	$ 26,557	$ 33,386

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