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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,226,897		$ 6,034,752	$ 6,568,791
Allowance for loan and lease losses	(45,072)	$ (42,385)	(40,444)	(40,233)	$ (37,483)	$ (35,533)
Loans and leases receivable, net	6,181,825		5,994,308
Purchased Credit Impaired
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		141,826	642,367
Allowance for loan and lease losses	0			(104)
Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	793,946		885,148
Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,432,951		5,007,778
Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	176,397		125,100
Total NTM and Traditional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,226,897		5,892,926
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,602,805		1,522,960	1,531,041
Allowance for loan and lease losses	(12,500)	(10,495)	(7,584)	(8,226)	(8,004)	(5,850)
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	713,120		729,959	721,838
Allowance for loan and lease losses	(5,328)	(5,126)	(5,467)	(5,026)	(3,554)	(4,252)
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,617,890		1,365,262	1,199,207
Allowance for loan and lease losses	(11,274)	(10,686)	(11,376)	(8,709)	(6,914)	(6,012)
Commercial | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	78,604		73,840	67,737
Allowance for loan and lease losses	(1,297)	(1,084)	(939)	(908)	(697)	(683)
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	176,397		125,100	99,086
Allowance for loan and lease losses	(3,212)	(2,974)	(2,015)	(1,717)	(1,677)	(1,530)
Commercial | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	91		379	234,540
Allowance for loan and lease losses	(2)	$ (3)	(6)	(2,967)	$ (2,540)	$ (2,195)
Commercial | Purchased Credit Impaired | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		4,760	4,796
Allowance for loan and lease losses	0			(57)
Commercial | Purchased Credit Impaired | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		1,182	2,418
Allowance for loan and lease losses	0			(11)
Commercial | Purchased Credit Impaired | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
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]
Loans	0		2,672	2,760
Allowance for loan and lease losses	0			(19)
Commercial | Purchased Credit Impaired | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
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]
Loans	0		0	0
Allowance for loan and lease losses	0			$ 0
Commercial | Non-Traditional Mortgages (NTM) | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Commercial | Non-Traditional Mortgages (NTM) | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Commercial | Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,602,805		1,518,200
Commercial | Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	713,120		728,777
Commercial | Traditional Loans | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,617,890		1,365,262
Commercial | Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	78,604		71,168
Commercial | Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	176,397		125,100
Commercial | Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	91		379
Commercial | Total NTM and Traditional Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,602,805		1,518,200
Commercial | Total NTM and Traditional Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	713,120		728,777
Commercial | Total NTM and Traditional Loans | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,617,890		1,365,262
Commercial | Total NTM and Traditional Loans | SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	78,604		71,168
Commercial | Total NTM and Traditional Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	176,397		125,100
Commercial | Total NTM and Traditional Loans | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	91		379
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,838,021		2,019,161
Consumer | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	82,289		87,469
Consumer | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,558		3,559
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	114,122		107,063
Consumer | Purchased Credit Impaired | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		133,212
Consumer | Purchased Credit Impaired | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Consumer | Purchased Credit Impaired | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Consumer | Purchased Credit Impaired | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Consumer | Non-Traditional Mortgages (NTM)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	793,946		885,148
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	790,388		881,589
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,558		3,559
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	708,099		794,120
Consumer | Non-Traditional Mortgages (NTM) | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	82,289		87,469
Consumer | Non-Traditional Mortgages (NTM) | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,558		3,559
Consumer | Non-Traditional Mortgages (NTM) | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Consumer | Traditional Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,129,922		1,091,829
Consumer | Traditional Loans | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Consumer | Traditional Loans | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0
Consumer | Traditional Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	114,122		107,063
Consumer | Total NTM and Traditional Loans | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,838,021		1,885,949
Consumer | Total NTM and Traditional Loans | Home equity loan | Green Loans (HELOC) - first liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	82,289		87,469
Consumer | Total NTM and Traditional Loans | Home equity loan | Green Loans (HELOC) - second liens
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,558		3,559
Consumer | Total NTM and Traditional Loans | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 114,122		$ 107,063

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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 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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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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