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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 117,488	$ 110,469
Current	5,345,580	5,073,925
Total ending loan balances	5,463,068	5,184,394	$ 3,933,715
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	75,097	63,754
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,116	16,483
Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	37,275	30,232
Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	53,997	47,185
Current	629,979	665,546
Total ending loan balances	683,976	712,731	241,798
Purchased Credit Impaired | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	43,819	33,893
Purchased Credit Impaired | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	372	6,398
Purchased Credit Impaired | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,806	6,894
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	799,801	785,908
Traditional Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	44,088
Current	3,935,203
Total ending loan balances	3,979,291	3,685,755
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	17,912
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,740
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	22,436
Traditional Loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	68,241	55,289
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	2,180,315	2,150,453
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	104,787	109,681
Consumer | Purchased Credit Impaired | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	51,527	44,414
Current	620,472	654,816
Total ending loan balances	671,999	699,230
Consumer | Purchased Credit Impaired | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	43,447	33,507
Consumer | Purchased Credit Impaired | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	372	6,235
Consumer | Purchased Credit Impaired | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,708	4,672
Consumer | Purchased Credit Impaired | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Consumer | Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,403	15,295
Current	780,398	770,613
Total ending loan balances	799,801	785,908
Consumer | Non-Traditional Mortgages (NTM) | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13,366	11,848
Consumer | Non-Traditional Mortgages (NTM) | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,004	0
Consumer | Non-Traditional Mortgages (NTM) | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,033	3,447
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	795,320	781,091
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	4,481	4,817
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,392	7,382
Current	684,798	668,578
Total ending loan balances	693,190	675,960
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,534	3,935
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,858	3,447
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,011	7,913
Current	91,119	97,218
Total ending loan balances	102,130	105,131
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,832	7,913
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,004	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,175	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	4,368	4,704
Total ending loan balances	4,368	4,704
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgages (NTM) | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	113	113
Total ending loan balances	113	113
Consumer | Non-Traditional Mortgages (NTM) | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgages (NTM) | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgages (NTM) | Other consumer | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Traditional Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		47,989
Current		3,637,766
Total ending loan balances		3,685,755
Consumer | Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		18,013
Consumer | Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		10,085
Consumer | Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		19,891
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	34,792	36,875
Current	780,334	738,388
Total ending loan balances	815,126	775,263
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,634	15,762
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	118	3,887
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20,040	17,226
Consumer | Traditional Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	62	222
Current	104,612	109,346
Total ending loan balances	104,674	109,568
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	11
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	62	211
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	983,961	876,999	489,229
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	713,693	727,707	975,734
Commercial | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	1,021,097	904,300	940,053
Commercial | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	71,640	57,706	48,254
Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	68,241	55,289	38,081
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	212,836	192,424	102,012
Commercial | Purchased Credit Impaired | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	175	176
Current	644	677
Total ending loan balances	819	853	1,079
Commercial | Purchased Credit Impaired | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Purchased Credit Impaired | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Purchased Credit Impaired | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	175	176
Commercial | Purchased Credit Impaired | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,425	1,425
Current	6,793	8,174
Total ending loan balances	8,218	9,599	10,432
Commercial | Purchased Credit Impaired | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Purchased Credit Impaired | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Purchased Credit Impaired | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,425	1,425
Commercial | Purchased Credit Impaired | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0	0
Commercial | Purchased Credit Impaired | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	870	1,170
Current	2,070	1,879
Total ending loan balances	2,940	3,049	3,136
Commercial | Purchased Credit Impaired | SBA | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	372	386
Commercial | Purchased Credit Impaired | SBA | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	163
Commercial | Purchased Credit Impaired | SBA | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	498	621
Commercial | Purchased Credit Impaired | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0	0
Commercial | Purchased Credit Impaired | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0	$ 0
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,129	5,551
Current	980,013	870,595
Total ending loan balances	983,142	876,146
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	109	23
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,521	4,984
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	499	544
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	844	911
Current	704,631	717,197
Total ending loan balances	705,475	718,108
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	299	0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	262	0
Commercial | Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	283	911
Commercial | Traditional Loans | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	416	655
Current	1,020,681	903,645
Total ending loan balances	1,021,097	904,300
Commercial | Traditional Loans | Multi-family | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	416	223
Commercial | Traditional Loans | Multi-family | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multi-family | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	432
Commercial | Traditional Loans | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	282	335
Current	68,418	54,322
Total ending loan balances	68,700	54,657
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	142	162
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	140	173
Commercial | Traditional Loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	68,241	55,289
Total ending loan balances	68,241	55,289
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Construction | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Construction | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,563	3,440
Current	208,273	188,984
Total ending loan balances	212,836	192,424
Commercial | Traditional Loans | Lease financing | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,454	2,005
Commercial | Traditional Loans | Lease financing | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	697	1,041
Commercial | Traditional Loans | Lease financing | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,412	$ 394

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Financing receivables that are current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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