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RELATED-PARTY TRANSACTIONS - Current Related Party Indemnification Costs (Details) - Special Committee Investigation - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Emeritus John Grosvenor | Former General Counsel |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties | $ 879 | $ 415 | $ 501
Steven A. Sugarman | Former President And Chief Executive Officer |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties | 11,900 | 8,500 | 3,000
Francisco A. Turner and James J. McKinney | Former Interim Chief Financial Officer And Chief Strategy Officer And Former Chief Financial Officer |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties | 795 | 400 | 631
Cynthia Abercrombie | Former Bank Director |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties | $ 180 | 292 |
Jonah F. Schnel | Director |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  | 854 |
Robert Sznewajs | Director |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  | 854 |
Jeffrey T. Seabold | Former Management Vice Chair |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  | 497 | 1,400
Halle J. Benett | Former Director |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  | 854 |
Jeffrey Karish | Director |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  | $ 854 |
Chad Brownstein | Former Director |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related parties |  |  | $ 509

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