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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	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 136,376	$ 110,469
Current	6,099,739	5,073,925
Total ending loan balances	6,236,115	5,184,394	$ 4,473,095
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	79,290	63,754
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,459	16,483
Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	37,627	30,232
Purchased Credit Impaired
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	57,207	47,185
Current	694,037	665,546
Total ending loan balances	751,244	712,731	266,372
Purchased Credit Impaired | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	41,942	33,893
Purchased Credit Impaired | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,313	6,398
Purchased Credit Impaired | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	8,952	6,894
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	842,634	785,908
Traditional Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	55,799
Current	4,586,438
Total ending loan balances	4,642,237	3,685,755
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	27,474
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,071
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	24,254
Traditional Loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	86,852	55,289
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	2,455,724	2,150,453
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	115,911	109,681
Consumer | Purchased Credit Impaired | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	56,052	44,414
Current	684,113	654,816
Total ending loan balances	740,165	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	41,467	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	6,313	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	8,272	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	23,370	15,295
Current	819,264	770,613
Total ending loan balances	842,634	785,908
Consumer | Non-Traditional Mortgages (NTM) | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,874	11,848
Consumer | Non-Traditional Mortgages (NTM) | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,075	0
Consumer | Non-Traditional Mortgages (NTM) | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,421	3,447
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	838,336	781,091
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	4,298	4,817
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13,445	7,382
Current	725,271	668,578
Total ending loan balances	738,716	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	2,124	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	9,075	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	2,246	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	9,925	7,913
Current	89,695	97,218
Total ending loan balances	99,620	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	7,750	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	0	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	4,298	4,704
Total ending loan balances	4,298	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	0	113
Total ending loan balances	0	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	42,297	36,875
Current	934,546	738,388
Total ending loan balances	976,843	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	20,064	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	3,212	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	19,021	17,226
Consumer | Traditional Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	206	222
Current	115,705	109,346
Total ending loan balances	115,911	109,568
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	179	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	27	211
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	1,306,866	876,999	771,477
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	725,107	727,707	807,146
Commercial | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	1,147,597	904,300	696,768
Commercial | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	65,477	57,706	56,887
Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	86,852	55,289	32,022
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	228,663	192,424	131,189
Commercial | Purchased Credit Impaired | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	171	176
Current	4,739	677
Total ending loan balances	4,910	853	365
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	171	176
Commercial | Purchased Credit Impaired | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	162	1,425
Current	3,164	8,174
Total ending loan balances	3,326	9,599	11,004
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	162	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	822	1,170
Current	2,021	1,879
Total ending loan balances	2,843	3,049	3,021
Commercial | Purchased Credit Impaired | SBA | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	475	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	347	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 | Non-Traditional Mortgages (NTM) | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Non-Traditional Mortgages (NTM) | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Non-Traditional Mortgages (NTM) | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Non-Traditional Mortgages (NTM) | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Non-Traditional Mortgages (NTM) | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Non-Traditional Mortgages (NTM) | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,107	5,551
Current	1,295,849	870,595
Total ending loan balances	1,301,956	876,146
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,968	23
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	269	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	2,870	544
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	274	911
Current	721,507	717,197
Total ending loan balances	721,781	718,108
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	274	911
Commercial | Traditional Loans | Multi-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	176	655
Current	1,147,421	903,645
Total ending loan balances	1,147,597	904,300
Commercial | Traditional Loans | Multi-family | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	176	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	630	335
Current	62,004	54,322
Total ending loan balances	62,634	54,657
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	357	0
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	162
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	273	173
Commercial | Traditional Loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	705	0
Current	86,147	55,289
Total ending loan balances	86,852	55,289
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	705	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	5,404	3,440
Current	223,259	188,984
Total ending loan balances	228,663	192,424
Commercial | Traditional Loans | Lease financing | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,025	2,005
Commercial | Traditional Loans | Lease financing | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	590	1,041
Commercial | Traditional Loans | Lease financing | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 1,789	$ 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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+ 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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