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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 4,473,095	$ 3,949,122		$ 2,602,213
Allowance for loan and lease losses	(34,787)	(29,480)	$ (29,345)	(22,627)	$ (20,003)	$ (18,805)
Loans and leases receivable, net	$ 4,438,308	$ 3,919,642
Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 771,477	$ 490,900		368,540
Allowance for loan and lease losses	(6,884)	(6,910)	(6,484)	(3,007)	(2,367)	(1,822)
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	807,146	999,857		535,744
Allowance for loan and lease losses	(4,445)	(3,840)	(3,904)	(5,615)	(6,449)	(5,484)
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	696,768	955,683		234,179
Allowance for loan and lease losses	(3,680)	(7,179)	(7,164)	(3,408)	(2,720)	(2,566)
SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	56,887	36,155		28,684
Allowance for loan and lease losses	(674)	(335)	(566)	(261)	(211)	(235)
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	32,022	42,198		30,761
Allowance for loan and lease losses	(579)	(846)	(695)	(1,245)	(352)	(244)
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	131,189	85,749		57,754
Allowance for loan and lease losses	(1,646)	(873)	$ (1,195)	$ (730)	$ (622)	$ (428)
Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,723,043	1,048,485
Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	117,881	123,177
Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,773	4,979
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	131,909	161,939
Purchased Credit Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 266,372	$ 246,897
Purchased Credit Impaired | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	6.00%	6.30%
Purchased Credit Impaired | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 365	$ 1,134
Purchased Credit Impaired | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	11,004	11,527
Purchased Credit Impaired | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Purchased Credit Impaired | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,021	3,157
Purchased Credit Impaired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Purchased Credit Impaired | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Purchased Credit Impaired | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	251,982	231,079
Purchased Credit Impaired | Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Purchased Credit Impaired | Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Purchased Credit Impaired | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 720,321	$ 350,575
Non-Traditional Mortgages (NTM) | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	16.10%	8.90%
Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 715,435	$ 345,483
Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,886	5,092
Non-Traditional Mortgages (NTM) | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Non-Traditional Mortgages (NTM) | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Non-Traditional Mortgages (NTM) | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Non-Traditional Mortgages (NTM) | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Non-Traditional Mortgages (NTM) | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Non-Traditional Mortgages (NTM) | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Non-Traditional Mortgages (NTM) | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	597,554	222,306
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	117,881	123,177
Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,773	4,979
Non-Traditional Mortgages (NTM) | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	113	113
Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 3,486,402	$ 3,351,650
Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	77.90%	84.80%
Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 771,112	$ 489,766
Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	796,142	988,330
Traditional Loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	696,768	955,683
Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	53,866	32,998
Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	32,022	42,198
Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	131,189	85,749
Traditional Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	873,507	595,100
Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	0	0
Traditional Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	131,796	161,826
Total NTM and Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 4,206,723	$ 3,702,225
Total NTM and Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	94.00%	93.70%
Total NTM and Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 771,112	$ 489,766
Total NTM and Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	796,142	988,330
Total NTM and Traditional Loans | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	696,768	955,683
Total NTM and Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	53,866	32,998
Total NTM and Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	32,022	42,198
Total NTM and Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	131,189	85,749
Total NTM and Traditional Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,471,061	817,406
Total NTM and Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	117,881	123,177
Total NTM and Traditional Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,773	4,979
Total NTM and Traditional Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 131,909	$ 161,939

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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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