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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, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 26,550	$ 41,629
Current	7,009,454	6,617,778
Total ending loan balances	7,036,004	6,659,407	$ 5,956,337
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,948	22,830
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,149	9,257
Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,453	9,542
NTM Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	818,876	806,933
Traditional Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	25,066	29,519
Current	6,192,062	5,822,955
Total ending loan balances	6,217,128	5,852,474
Traditional Loans and Leases | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,158	13,770
Traditional Loans and Leases | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,455	7,378
Traditional Loans and Leases | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,453	8,371
Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	211,110	182,960
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	2,174,183	2,055,649
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	76,240	106,579
Consumer | NTM Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,484	12,110
Current	817,392	794,823
Total ending loan balances	818,876	806,933
Consumer | NTM Loans | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	790	9,060
Consumer | NTM Loans | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	694	1,879
Consumer | NTM Loans | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,171
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,484	12,110
Current	813,890	791,245
Total ending loan balances	815,374	803,355
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	790	9,060
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	694	1,879
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	1,171
Consumer | NTM Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	3,502	3,578
Total ending loan balances	3,502	3,578
Consumer | NTM Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | NTM Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | NTM Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Consumer | Traditional Loans and Leases | Single family residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,864	16,244
Current	1,343,945	1,236,050
Total ending loan balances	1,358,809	1,252,294
Consumer | Traditional Loans and Leases | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,647	6,862
Consumer | Traditional Loans and Leases | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,422	3,370
Consumer | Traditional Loans and Leases | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,795	6,012
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,094	3,699
Current	70,644	99,302
Total ending loan balances	72,738	103,001
Consumer | Traditional Loans and Leases | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,831	3,194
Consumer | Traditional Loans and Leases | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	413
Consumer | Traditional Loans and Leases | Other consumer | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	263	92
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	1,742,559	1,701,951	1,560,916
Commercial | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	793,855	717,415	716,771
Commercial | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	1,959,965	1,816,141	1,545,888
Commercial | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	78,092	78,699	77,254
Commercial | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	211,110	182,960	156,246
Commercial | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	13	$ 173
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | NTM Loans | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total ending loan balances	0	0
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,181	4,679
Current	1,736,378	1,697,272
Total ending loan balances	1,742,559	1,701,951
Commercial | Traditional Loans and Leases | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,075	136
Commercial | Traditional Loans and Leases | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,509	3,595
Commercial | Traditional Loans and Leases | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	597	948
Commercial | Traditional Loans and Leases | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	793,855	717,415
Total ending loan balances	793,855	717,415
Commercial | Traditional Loans and Leases | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Current	1,959,965	1,816,141
Total ending loan balances	1,959,965	1,816,141
Commercial | Traditional Loans and Leases | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Multifamily | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | SBA
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,460	4,897
Current	76,632	73,802
Total ending loan balances	78,092	78,699
Commercial | Traditional Loans and Leases | SBA | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	138	3,578
Commercial | Traditional Loans and Leases | SBA | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	524	0
Commercial | Traditional Loans and Leases | SBA | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	798	1,319
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	467	0
Current	210,643	182,960
Total ending loan balances	211,110	182,960
Commercial | Traditional Loans and Leases | Construction | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	467	0
Commercial | Traditional Loans and Leases | Construction | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Construction | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans and Leases | Lease financing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0
Current		13
Total ending loan balances	$ 0	13
Commercial | Traditional Loans and Leases | Lease financing | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0
Commercial | Traditional Loans and Leases | Lease financing | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0
Commercial | Traditional Loans and Leases | Lease financing | Greater than 89 Days Past due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 0

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Financing receivables that are current.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Amount before allowance and after 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.

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