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Summary of Significant Accounting Policies, Nature of Operations and Principles of Consolidation (Details) | Dec. 31, 2020 Office
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Los Angeles, California [Member] |
Nature of Operations and Principles of Consolidation [Abstract] |
Number of retail-banking offices | 2
Inglewood, California [Member] |
Nature of Operations and Principles of Consolidation [Abstract] |
Number of retail-banking offices | 1

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