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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 7,557,200	$ 7,700,873	$ 6,930,507
Allowance for loan and lease losses	(63,885)	(62,192)	(54,763)	$ (49,333)
Loans and leases receivable, net	$ 7,493,315	$ 7,638,681
Percentage to total loans and leases (percent)	100.00%	100.00%
NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 790,405	$ 826,731
Percentage to total loans and leases (percent)	10.50%	10.70%
Deferred loan costs/(fees) and premiums/(discounts), net	$ 16,800	$ 17,700
Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 6,766,795	$ 6,874,142
Percentage to total loans and leases (percent)	89.50%	89.30%
Traditional Loans and Leases | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 211,549	$ 203,976
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,907,102	1,944,142	1,638,559
Allowance for loan and lease losses	(18,893)	(18,191)	(17,571)	(14,280)
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	865,521	867,013	773,193
Allowance for loan and lease losses	(6,838)	(6,674)	(5,417)	(4,971)
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,332,527	2,241,246	1,944,082
Allowance for loan and lease losses	(18,898)	(17,970)	(14,219)	(13,265)
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	74,998	68,741	79,022
Allowance for loan and lease losses	(3,057)	(1,827)	(1,577)	(1,701)
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	211,549	203,976	200,766
Allowance for loan and lease losses	(3,453)	(3,461)	$ (3,220)	$ (3,318)
Commercial | NTM Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,907,102	1,944,142
Commercial | Traditional Loans and Leases | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	865,521	867,013
Commercial | Traditional Loans and Leases | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,332,527	2,241,246
Commercial | Traditional Loans and Leases | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	74,998	68,741
Commercial | Traditional Loans and Leases | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	211,549	203,976
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,102,694	2,305,490
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	62,809	70,265
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	790,405	826,731
Consumer | NTM Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	788,054	824,318
Consumer | NTM Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,351	2,413
Consumer | Traditional Loans and Leases | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,314,640	1,481,172
Consumer | Traditional Loans and Leases | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 60,458	$ 67,852

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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