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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 41,629 | $ 62,013
Current | 6,617,778 | 5,972,739
Total ending loan balances | 6,659,407 | 6,034,752
30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 22,830 | 38,180
60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9,257 | 7,038
Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9,542 | 16,795
NTM Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 806,933 | 885,148
Traditional Loans and Leases |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 29,519 |
Current | 5,822,955 |
Total ending loan balances | 5,852,474 | 5,007,778
Traditional Loans and Leases | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 13,770 |
Traditional Loans and Leases | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 7,378 |
Traditional Loans and Leases | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 8,371 |
PCI Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 17,655
Current | 0 | 124,171
Total ending loan balances | 0 | 141,826
PCI Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 10,783
PCI Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 4,295
PCI Loans | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 2,577
Consumer | Single family residential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 1,973,452 | 2,019,161
Consumer | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 103,001 | 107,063
Consumer | NTM Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 12,110 | 4,660
Current | 794,823 | 880,488
Total ending loan balances | 806,933 | 885,148
Consumer | NTM Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9,060 | 4,193
Consumer | NTM Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,879 | 0
Consumer | NTM Loans | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,171 | 467
Consumer | NTM Loans | Green Loans (HELOC) - first liens |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 803,355 | 881,589
Consumer | NTM Loans | Green Loans (HELOC) - second liens |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 3,578 | 3,559
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 6,111 | 4,660
Current | 715,047 | 789,460
Total ending loan balances | 721,158 | 794,120
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,353 | 4,193
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,587 | 0
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,171 | 467
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 5,999 | 0
Current | 76,198 | 87,469
Total ending loan balances | 82,197 | 87,469
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 5,707 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 292 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 3,578 | 3,559
Total ending loan balances | 3,578 | 3,559
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Consumer | NTM Loans | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 0 | 0
Total ending loan balances | 0 | 0
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 |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 39,698
Current |  | 4,968,080
Total ending loan balances |  | 5,007,778
Consumer | Traditional Loans and Leases | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 23,204
Consumer | Traditional Loans and Leases | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 2,743
Consumer | Traditional Loans and Leases | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 13,751
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 16,244 | 21,963
Current | 1,236,050 | 1,069,866
Total ending loan balances | 1,252,294 | 1,091,829
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 | 6,862 | 11,225
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 | 3,370 | 1,345
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 | 6,012 | 9,393
Consumer | Traditional Loans and Leases | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,699 | 11,338
Current | 99,302 | 95,725
Total ending loan balances | 103,001 | 107,063
Consumer | Traditional Loans and Leases | Other consumer | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,194 | 10,023
Consumer | Traditional Loans and Leases | Other consumer | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 413 | 933
Consumer | Traditional Loans and Leases | Other consumer | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 92 | 382
Consumer | PCI Loans | Single family residential mortgage |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 16,639
Current | 0 | 116,573
Total ending loan balances | 0 | 133,212
Consumer | PCI Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 10,483
Consumer | PCI Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 4,063
Consumer | PCI Loans | Single family residential mortgage | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 2,093
Consumer | PCI Loans | Other consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 0 | 0
Commercial | Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 1,701,951 | 1,522,960
Commercial | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 717,415 | 729,959
Commercial | Multifamily |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 1,816,141 | 1,365,262
Commercial | SBA |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 78,699 | 73,840
Commercial | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 182,960 | 125,100
Commercial | Lease financing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 13 | 379
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 | 4,679 | 4,260
Current | 1,697,272 | 1,513,940
Total ending loan balances | 1,701,951 | 1,518,200
Commercial | Traditional Loans and Leases | Commercial and industrial | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 136 | 412
Commercial | Traditional Loans and Leases | Commercial and industrial | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,595 | 463
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 | 948 | 3,385
Commercial | Traditional Loans and Leases | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 717,415 | 728,777
Total ending loan balances | 717,415 | 728,777
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 | 1,816,141 | 1,365,262
Total ending loan balances | 1,816,141 | 1,365,262
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 | 4,897 | 499
Current | 73,802 | 70,669
Total ending loan balances | 78,699 | 71,168
Commercial | Traditional Loans and Leases | SBA | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,578 | 15
Commercial | Traditional Loans and Leases | SBA | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 2
Commercial | Traditional Loans and Leases | SBA | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,319 | 482
Commercial | Traditional Loans and Leases | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 1,529
Current | 182,960 | 123,571
Total ending loan balances | 182,960 | 125,100
Commercial | Traditional Loans and Leases | Construction | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 1,529
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 | 109
Current | 13 | 270
Total ending loan balances | 13 | 379
Commercial | Traditional Loans and Leases | Lease financing | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 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 | 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 | 109
Commercial | PCI Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 156
Current | 0 | 4,604
Total ending loan balances | 0 | 4,760
Commercial | PCI Loans | Commercial and industrial | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Commercial | PCI Loans | Commercial and industrial | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Commercial | PCI Loans | Commercial and industrial | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 156
Commercial | PCI Loans | Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 0 | 1,182
Total ending loan balances | 0 | 1,182
Commercial | PCI Loans | Commercial real estate | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Commercial | PCI Loans | Commercial real estate | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Commercial | PCI Loans | Commercial real estate | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Commercial | PCI Loans | Multifamily |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 0 | 0
Commercial | PCI Loans | SBA |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 860
Current | 0 | 1,812
Total ending loan balances | 0 | 2,672
Commercial | PCI Loans | SBA | 30 - 59 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 300
Commercial | PCI Loans | SBA | 60 - 89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 232
Commercial | PCI Loans | SBA | Greater than 89 Days Past due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 0 | 328
Commercial | PCI Loans | Construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | 0 | 0
Commercial | PCI Loans | Lease financing |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total ending loan balances | $ 0 | $ 0

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 + Details
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