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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, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | $ 6,659,407 | $ 6,034,752
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 6,578,813 | 5,865,052
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 39,770 | 12,260
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 40,718 | 24,150
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 106 | 78
Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 133,212
PCI Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 141,826
PCI Loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 2,450
PCI Loans | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 4,056
PCI Loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 2,108
PCI Loans | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
PCI Loans | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 133,212
NTM Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 806,933 | 885,148
Traditional Loans and Leases |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 5,852,474 | 5,007,778
Traditional Loans and Leases | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 5,774,646 | 4,981,404
Traditional Loans and Leases | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 38,175 | 4,721
Traditional Loans and Leases | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 39,547 | 21,575
Traditional Loans and Leases | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 106 | 78
Traditional Loans and Leases | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | Single family residential mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,973,452 | 2,019,161
Consumer | Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 103,001 | 107,063
Consumer | PCI Loans | Single family residential mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 133,212
Consumer | PCI Loans | Single family residential mortgage | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | PCI Loans | Single family residential mortgage | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | PCI Loans | Single family residential mortgage | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | PCI Loans | Single family residential mortgage | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | PCI Loans | Single family residential mortgage | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 133,212
Consumer | PCI Loans | Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 806,933 | 885,148
Consumer | NTM Loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 804,167 | 881,198
Consumer | NTM Loans | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,595 | 3,483
Consumer | NTM Loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,171 | 467
Consumer | NTM Loans | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Green Loans (HELOC) - first liens |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 803,355 | 881,589
Consumer | NTM Loans | Green Loans (HELOC) - second liens |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 3,578 | 3,559
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 721,158 | 794,120
Consumer | NTM Loans | Single family residential mortgage | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 719,182 | 792,179
Consumer | NTM Loans | Single family residential mortgage | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 805 | 1,474
Consumer | NTM Loans | Single family residential mortgage | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,171 | 467
Consumer | NTM Loans | Single family residential mortgage | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Single family residential mortgage | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 82,197 | 87,469
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 81,407 | 85,460
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 790 | 2,009
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 3,578 | 3,559
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 3,578 | 3,559
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Other consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Other consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Other consumer | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Other consumer | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | NTM Loans | Other consumer | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | Traditional Loans and Leases |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases |  | 5,007,778
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,252,294 | 1,091,829
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,240,866 | 1,080,664
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 2,282 | 950
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 9,146 | 10,215
Consumer | Traditional Loans and Leases | Single family residential mortgage | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | Traditional Loans and Leases | Single family residential mortgage | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | Traditional Loans and Leases | Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 103,001 | 107,063
Consumer | Traditional Loans and Leases | Other consumer | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 98,030 | 106,632
Consumer | Traditional Loans and Leases | Other consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 422 | 48
Consumer | Traditional Loans and Leases | Other consumer | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 4,549 | 383
Consumer | Traditional Loans and Leases | Other consumer | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Consumer | Traditional Loans and Leases | Other consumer | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,701,951 | 1,522,960
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 717,415 | 729,959
Commercial | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,816,141 | 1,365,262
Commercial | SBA |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 78,699 | 73,840
Commercial | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 182,960 | 125,100
Commercial | Lease financing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 13 | 379
Commercial | PCI Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 4,760
Commercial | PCI Loans | Commercial and industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 4,056
Commercial | PCI Loans | Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 704
Commercial | PCI Loans | Commercial and industrial | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Commercial and industrial | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 1,182
Commercial | PCI Loans | Commercial real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 1,182
Commercial | PCI Loans | Commercial real estate | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Commercial real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Commercial real estate | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Commercial real estate | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | SBA |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 2,672
Commercial | PCI Loans | SBA | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 1,268
Commercial | PCI Loans | SBA | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | SBA | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 1,404
Commercial | PCI Loans | SBA | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | SBA | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | PCI Loans | Lease financing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | NTM Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | NTM Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | NTM Loans | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | NTM Loans | SBA |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | NTM Loans | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | NTM Loans | Lease financing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,701,951 | 1,518,200
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,651,628 | 1,508,636
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 33,376 | 844
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 16,947 | 8,642
Commercial | Traditional Loans and Leases | Commercial and industrial | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 78
Commercial | Traditional Loans and Leases | Commercial and industrial | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Commercial real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 717,415 | 728,777
Commercial | Traditional Loans and Leases | Commercial real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 713,131 | 725,861
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 1,350
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 4,284 | 1,566
Commercial | Traditional Loans and Leases | Commercial real estate | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Commercial real estate | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,816,141 | 1,365,262
Commercial | Traditional Loans and Leases | Multifamily | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,815,601 | 1,365,262
Commercial | Traditional Loans and Leases | Multifamily | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 540 | 0
Commercial | Traditional Loans and Leases | Multifamily | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Multifamily | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Multifamily | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | SBA |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 78,699 | 71,168
Commercial | Traditional Loans and Leases | SBA | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 72,417 | 70,508
Commercial | Traditional Loans and Leases | SBA | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 1,555 | 0
Commercial | Traditional Loans and Leases | SBA | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 4,621 | 660
Commercial | Traditional Loans and Leases | SBA | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 106 | 0
Commercial | Traditional Loans and Leases | SBA | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 182,960 | 125,100
Commercial | Traditional Loans and Leases | Construction | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 182,960 | 123,571
Commercial | Traditional Loans and Leases | Construction | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 1,529
Commercial | Traditional Loans and Leases | Construction | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Construction | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Construction | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Lease financing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 13 | 379
Commercial | Traditional Loans and Leases | Lease financing | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 13 | 270
Commercial | Traditional Loans and Leases | Lease financing | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Lease financing | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 109
Commercial | Traditional Loans and Leases | Lease financing | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | 0 | 0
Commercial | Traditional Loans and Leases | Lease financing | Not-Rated |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans and leases | $ 0 | $ 0

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