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LOANS AND ALLOWANCE FOR LOAN LOSSES - Risk Categories for Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 5,951,885 | $ 7,700,873
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,782,383 | 7,543,176
Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 67,531 | 76,945
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 99,836 | 79,898
Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,135 | 854
NTM Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 600,656 | 826,731
Traditional Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,351,229 | 6,874,142
Traditional Loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,200,536 | 6,729,707
Traditional Loans | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 61,741 | 65,979
Traditional Loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 86,817 | 77,602
Traditional Loans | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,135 | 854
Consumer | Single family residential mortgage |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,590,774 | 2,305,490
Consumer | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 54,165 | 70,265
Consumer | NTM Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 600,656 | 826,731
Consumer | NTM Loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 581,847 | 813,469
Consumer | NTM Loans | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,790 | 10,966
Consumer | NTM Loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 13,019 | 2,296
Consumer | NTM Loans | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Consumer | NTM Loans | Single family residential mortgage |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 598,357 | 824,318
Consumer | NTM Loans | Single family residential mortgage | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 579,548 | 811,056
Consumer | NTM Loans | Single family residential mortgage | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,790 | 10,966
Consumer | NTM Loans | Single family residential mortgage | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 13,019 | 2,296
Consumer | NTM Loans | Single family residential mortgage | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Consumer | NTM Loans | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,299 | 2,413
Consumer | NTM Loans | Other consumer | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,299 | 2,413
Consumer | NTM Loans | Other consumer | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Consumer | NTM Loans | Other consumer | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Consumer | NTM Loans | Other consumer | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Consumer | Traditional Loans | Single family residential mortgage |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 992,417 | 1,481,172
Consumer | Traditional Loans | Single family residential mortgage | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 979,705 | 1,461,721
Consumer | Traditional Loans | Single family residential mortgage | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 4,945 | 2,602
Consumer | Traditional Loans | Single family residential mortgage | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 7,250 | 16,849
Consumer | Traditional Loans | Single family residential mortgage | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 517 | 0
Consumer | Traditional Loans | Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 51,866 | 67,852
Consumer | Traditional Loans | Other consumer | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 51,032 | 66,228
Consumer | Traditional Loans | Other consumer | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 346 | 979
Consumer | Traditional Loans | Other consumer | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 488 | 645
Consumer | Traditional Loans | Other consumer | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,691,270 | 1,944,142
Commercial | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 818,817 | 867,013
Commercial | Multifamily |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,494,528 | 2,241,246
Commercial | SBA |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 70,981 | 68,741
Commercial | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 231,350 | 203,976
Commercial | NTM Loans | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | NTM Loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | NTM Loans | Multifamily |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | NTM Loans | SBA |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | NTM Loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | Traditional Loans | Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,691,270 | 1,944,142
Commercial | Traditional Loans | Commercial and industrial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,580,269 | 1,859,569
Commercial | Traditional Loans | Commercial and industrial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 45,323 | 41,302
Commercial | Traditional Loans | Commercial and industrial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 65,678 | 43,271
Commercial | Traditional Loans | Commercial and industrial | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | Traditional Loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 818,817 | 867,013
Commercial | Traditional Loans | Commercial real estate | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 813,846 | 851,604
Commercial | Traditional Loans | Commercial real estate | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,532 | 11,376
Commercial | Traditional Loans | Commercial real estate | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,439 | 4,033
Commercial | Traditional Loans | Commercial real estate | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | Traditional Loans | Multifamily |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,494,528 | 2,241,246
Commercial | Traditional Loans | Multifamily | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,484,931 | 2,239,301
Commercial | Traditional Loans | Multifamily | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 4,256 | 0
Commercial | Traditional Loans | Multifamily | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,341 | 1,945
Commercial | Traditional Loans | Multifamily | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial | Traditional Loans | SBA |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 70,981 | 68,741
Commercial | Traditional Loans | SBA | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 60,982 | 53,433
Commercial | Traditional Loans | SBA | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,760 | 6,114
Commercial | Traditional Loans | SBA | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,621 | 8,340
Commercial | Traditional Loans | SBA | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,618 | 854
Commercial | Traditional Loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 231,350 | 203,976
Commercial | Traditional Loans | Construction | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 229,771 | 197,851
Commercial | Traditional Loans | Construction | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,579 | 3,606
Commercial | Traditional Loans | Construction | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 2,519
Commercial | Traditional Loans | Construction | Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 0 | $ 0

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