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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 6,236,115		$ 5,184,394	$ 4,473,095
Allowance for loan and lease losses	(37,483)	$ (35,845)	(35,533)	(34,787)	$ (29,345)	$ (29,480)
Loans and leases receivable, net	6,198,632		5,148,861
Purchased Credit Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	751,244		712,731	266,372
Allowance for loan and lease losses	(104)			(206)
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	842,634		785,908
Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,642,237		3,685,755
Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	86,852		55,289
Total NTM and Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,484,871		4,471,663
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,306,866		876,999	771,477
Allowance for loan and lease losses	(8,004)	(6,046)	(5,850)	(6,884)	(6,484)	(6,910)
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	725,107		727,707	807,146
Allowance for loan and lease losses	(3,554)	(3,969)	(4,252)	(4,445)	(3,904)	(3,840)
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,147,597		904,300	696,768
Allowance for loan and lease losses	(6,914)	(6,484)	(6,012)	(3,680)	(7,164)	(7,179)
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	65,477		57,706	56,887
Allowance for loan and lease losses	(697)	(906)	(683)	(674)	(566)	(335)
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	86,852		55,289	32,022
Allowance for loan and lease losses	(1,677)	(1,520)	(1,530)	(579)	(695)	(846)
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	228,663		192,424	131,189
Allowance for loan and lease losses	(2,540)	$ (2,610)	(2,195)	(1,646)	$ (1,195)	$ (873)
Commercial | Purchased Credit Impaired | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,910		853	365
Allowance for loan and lease losses	(57)			(58)
Commercial | Purchased Credit Impaired | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,326		9,599	11,004
Allowance for loan and lease losses	(11)			(112)
Commercial | Purchased Credit Impaired | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0	0
Allowance for loan and lease losses	0			0
Commercial | Purchased Credit Impaired | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,843		3,049	3,021
Allowance for loan and lease losses	(19)			(19)
Commercial | Purchased Credit Impaired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0	0
Allowance for loan and lease losses	0			0
Commercial | Purchased Credit Impaired | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0	0
Allowance for loan and lease losses	0			$ 0
Commercial | Non-Traditional Mortgages (NTM) | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Commercial | Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,301,956		876,146
Commercial | Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	721,781		718,108
Commercial | Traditional Loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,147,597		904,300
Commercial | Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	62,634		54,657
Commercial | Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	86,852		55,289
Commercial | Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	228,663		192,424
Commercial | Total NTM and Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,301,956		876,146
Commercial | Total NTM and Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	721,781		718,108
Commercial | Total NTM and Traditional Loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,147,597		904,300
Commercial | Total NTM and Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	62,634		54,657
Commercial | Total NTM and Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	86,852		55,289
Commercial | Total NTM and Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	228,663		192,424
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,455,724		2,150,453
Consumer | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	99,620		105,131
Consumer | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,298		4,704
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	115,911		109,681
Consumer | Purchased Credit Impaired | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	740,165		699,230
Consumer | Purchased Credit Impaired | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Consumer | Purchased Credit Impaired | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Consumer | Purchased Credit Impaired | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Consumer | Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	842,634		785,908
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	838,336		781,091
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,298		4,817
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	738,716		675,960
Consumer | Non-Traditional Mortgages (NTM) | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	99,620		105,131
Consumer | Non-Traditional Mortgages (NTM) | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,298		4,704
Consumer | Non-Traditional Mortgages (NTM) | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		113
Consumer | Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans			3,685,755
Consumer | Traditional Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	976,843		775,263
Consumer | Traditional Loans | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Consumer | Traditional Loans | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0		0
Consumer | Traditional Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	115,911		109,568
Consumer | Total NTM and Traditional Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,715,559		1,451,223
Consumer | Total NTM and Traditional Loans | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	99,620		105,131
Consumer | Total NTM and Traditional Loans | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,298		4,704
Consumer | Total NTM and Traditional Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 115,911		$ 109,681

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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 of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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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