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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	$ 7,700,873	$ 6,659,407
Allowance for loan and lease losses	(62,192)	(49,333)	$ (40,444)	$ (35,533)
Loans and leases receivable, net	$ 7,638,681	$ 6,610,074
Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases	100.00%	100.00%
NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	$ 826,731	$ 806,933
Deferred loan origination costs/(fees) and premiums/(discounts), net	$ 17,700	$ 6,400
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases	10.70%	12.10%
Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	$ 6,874,142	$ 5,852,474
Traditional Loans and Leases | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases	89.30%	87.90%
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	$ 1,944,142	$ 1,701,951
Allowance for loan and lease losses	(18,191)	(14,280)	(7,584)
Commercial | Commercial and industrial | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	0
Commercial | Commercial and industrial | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	1,944,142	1,701,951
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	867,013	717,415
Allowance for loan and lease losses	(6,674)	(4,971)	(5,467)
Commercial | Commercial real estate | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	0
Commercial | Commercial real estate | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	867,013	717,415
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	2,241,246	1,816,141
Allowance for loan and lease losses	(17,970)	(13,265)	(11,376)
Commercial | Multifamily | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	0
Commercial | Multifamily | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	2,241,246	1,816,141
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	68,741	78,699
Allowance for loan and lease losses	(1,827)	(1,701)	(939)
Commercial | SBA | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	0
Commercial | SBA | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	68,741	78,699
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	203,976	182,960
Allowance for loan and lease losses	(3,461)	(3,318)	(2,015)
Commercial | Construction | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	0
Commercial | Construction | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	203,976	182,960
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	13
Allowance for loan and lease losses	0	0	$ (6)
Commercial | Lease financing | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	0
Commercial | Lease financing | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	0	13
Consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	$ 826,731	$ 806,933
Consumer | NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage to total loans and leases	10.70%	12.10%
Consumer | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)		$ 5,852,474
Consumer | Green Loans (HELOC) - first liens | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	$ 824,318	803,355
Consumer | Green Loans (HELOC) - second liens | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	2,413	3,578
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	2,305,490	2,055,649
Consumer | Single family residential mortgage | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	824,318	803,355
Consumer | Single family residential mortgage | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	1,481,172	1,252,294
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	70,265	106,579
Consumer | Other consumer | NTM Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	2,413	3,578
Consumer | Other consumer | Traditional Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases (1)	$ 67,852	$ 103,001

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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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