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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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