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LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 5,951,885	$ 7,700,873
Allowance for loan losses	(57,649)	(62,192)	$ (49,333)	$ (40,444)
Loans receivable, net	$ 5,894,236	$ 7,638,681
Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases (percent)	100.00%	100.00%
Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 5,351,229	$ 6,874,142
Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases (percent)	89.90%	89.30%
NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 600,656	$ 826,731
Deferred loan origination costs/(fees) and premiums/(discounts), net	$ 14,300	$ 17,700
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases (percent)	10.10%	10.70%
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,691,270	$ 1,944,142
Allowance for loan losses	(22,353)	(18,191)	(14,280)
Commercial | Commercial and industrial | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,691,270	1,944,142
Commercial | Commercial and industrial | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	818,817	867,013
Allowance for loan losses	(5,941)	(6,674)	(4,971)
Commercial | Commercial real estate | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	818,817	867,013
Commercial | Commercial real estate | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,494,528	2,241,246
Allowance for loan losses	(11,405)	(17,970)	(13,265)
Commercial | Multifamily | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,494,528	2,241,246
Commercial | Multifamily | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	70,981	68,741
Allowance for loan losses	(3,120)	(1,827)	(1,701)
Commercial | SBA | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	70,981	68,741
Commercial | SBA | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	231,350	203,976
Allowance for loan losses	(3,906)	(3,461)	$ (3,318)
Commercial | Construction | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	231,350	203,976
Commercial | Construction | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	0	0
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	600,656	826,731
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,590,774	2,305,490
Consumer | Single family residential mortgage | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	992,417	1,481,172
Consumer | Single family residential mortgage | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	598,357	824,318
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	54,165	70,265
Consumer | Other consumer | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	51,866	67,852
Consumer | Other consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,299	$ 2,413

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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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