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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Risk Categories for Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	$ 7,700,873	$ 6,659,407
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	7,543,176	6,578,813
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	76,945	39,770
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	79,898	40,718
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	854	106
NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	826,731	806,933
Traditional Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	6,874,142	5,852,474
Traditional Loans and Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	6,729,707	5,774,646
Traditional Loans and Leases | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	65,979	38,175
Traditional Loans and Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	77,602	39,547
Traditional Loans and Leases | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	854	106
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,305,490	2,055,649
Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	70,265	106,579
Consumer | NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	826,731	806,933
Consumer | NTM Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	813,469	804,167
Consumer | NTM Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	10,966	1,595
Consumer | NTM Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,296	1,171
Consumer | NTM Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Consumer | NTM Loans | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	824,318	803,355
Consumer | NTM Loans | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,413	3,578
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	824,318	803,355
Consumer | NTM Loans | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	811,056	800,589
Consumer | NTM Loans | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	10,966	1,595
Consumer | NTM Loans | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,296	1,171
Consumer | NTM Loans | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Consumer | NTM Loans | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,413	3,578
Consumer | NTM Loans | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,413	3,578
Consumer | NTM Loans | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Consumer | NTM Loans | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Consumer | NTM Loans | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Consumer | Traditional Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)		5,852,474
Consumer | Traditional Loans and Leases | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	1,481,172	1,252,294
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	1,461,721	1,240,866
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,602	2,282
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	16,849	9,146
Consumer | Traditional Loans and Leases | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	67,852	103,001
Consumer | Traditional Loans and Leases | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	66,228	98,030
Consumer | Traditional Loans and Leases | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	979	422
Consumer | Traditional Loans and Leases | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	645	4,549
Consumer | Traditional Loans and Leases | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	1,944,142	1,701,951
Commercial | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	867,013	717,415
Commercial | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,241,246	1,816,141
Commercial | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	68,741	78,699
Commercial | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	203,976	182,960
Commercial | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	13
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | NTM Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | NTM Loans | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | NTM Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | NTM Loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	1,944,142	1,701,951
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	1,859,569	1,651,628
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	41,302	33,376
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	43,271	16,947
Commercial | Traditional Loans and Leases | Commercial and industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Traditional Loans and Leases | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	867,013	717,415
Commercial | Traditional Loans and Leases | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	851,604	713,131
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	11,376	0
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	4,033	4,284
Commercial | Traditional Loans and Leases | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Traditional Loans and Leases | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,241,246	1,816,141
Commercial | Traditional Loans and Leases | Multifamily | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,239,301	1,815,601
Commercial | Traditional Loans and Leases | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	540
Commercial | Traditional Loans and Leases | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	1,945	0
Commercial | Traditional Loans and Leases | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Traditional Loans and Leases | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	68,741	78,699
Commercial | Traditional Loans and Leases | SBA | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	53,433	72,417
Commercial | Traditional Loans and Leases | SBA | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	6,114	1,555
Commercial | Traditional Loans and Leases | SBA | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	8,340	4,621
Commercial | Traditional Loans and Leases | SBA | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	854	106
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	203,976	182,960
Commercial | Traditional Loans and Leases | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	197,851	182,960
Commercial | Traditional Loans and Leases | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	3,606	0
Commercial | Traditional Loans and Leases | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	2,519	0
Commercial | Traditional Loans and Leases | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Traditional Loans and Leases | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	13
Commercial | Traditional Loans and Leases | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	13
Commercial | Traditional Loans and Leases | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Traditional Loans and Leases | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	0	0
Commercial | Traditional Loans and Leases | Lease financing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases (1)	$ 0	$ 0

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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