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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, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 5,463,068	$ 5,184,394	$ 3,933,715
Allowance for loan and lease losses	(35,845)	(35,533)	(29,345)	$ (29,480)
Loans and leases receivable, net	$ 5,427,223	$ 5,148,861
Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
Purchased Credit Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 683,976	$ 712,731	241,798
Allowance for loan and lease losses	$ (206)		(206)
Purchased Credit Impaired | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	12.60%	13.70%
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 799,801	$ 785,908
Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	14.60%	15.20%
Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 3,979,291	$ 3,685,755
Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	72.80%	71.10%
Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 68,241	$ 55,289
Total NTM and Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 4,779,092	$ 4,471,663
Total NTM and Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	87.40%	86.30%
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 983,961	$ 876,999	489,229
Allowance for loan and lease losses	(6,046)	(5,850)	(6,484)	(6,910)
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	713,693	727,707	975,734
Allowance for loan and lease losses	(3,969)	(4,252)	(3,904)	(3,840)
Commercial | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,021,097	904,300	940,053
Allowance for loan and lease losses	(6,484)	(6,012)	(7,164)	(7,179)
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	71,640	57,706	48,254
Allowance for loan and lease losses	(906)	(683)	(566)	(335)
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	68,241	55,289	38,081
Allowance for loan and lease losses	(1,520)	(1,530)	(695)	(846)
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	212,836	192,424	102,012
Allowance for loan and lease losses	(2,610)	(2,195)	(1,195)	$ (873)
Commercial | Purchased Credit Impaired | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	819	853	1,079
Allowance for loan and lease losses	(58)		(58)
Commercial | Purchased Credit Impaired | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	8,218	9,599	10,432
Allowance for loan and lease losses	(112)		(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	2,940	3,049	3,136
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 | Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	983,142	876,146
Commercial | Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	705,475	718,108
Commercial | Traditional Loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,021,097	904,300
Commercial | Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	68,700	54,657
Commercial | Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	68,241	55,289
Commercial | Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	212,836	192,424
Commercial | Total NTM and Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	983,142	876,146
Commercial | Total NTM and Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	705,475	718,108
Commercial | Total NTM and Traditional Loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,021,097	904,300
Commercial | Total NTM and Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	68,700	54,657
Commercial | Total NTM and Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	68,241	55,289
Commercial | Total NTM and Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	212,836	192,424
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	2,180,315	2,150,453
Consumer | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	102,130	105,131
Consumer | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,368	4,704
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	104,787	109,681
Consumer | Purchased Credit Impaired | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	671,999	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	$ 799,801	$ 785,908
Consumer | Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	14.60%	15.20%
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 795,320	$ 781,091
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,481	4,817
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	693,190	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	102,130	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	4,368	4,704
Consumer | Non-Traditional Mortgages (NTM) | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	113	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	815,126	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	104,674	109,568
Consumer | Total NTM and Traditional Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,508,316	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	102,130	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	4,368	4,704
Consumer | Total NTM and Traditional Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 104,787	$ 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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