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OPERATING LEASE COMMITMENTS AND CONTINGENCIES - Trust Department Tax Reporting Contingency (Details) - Trust Department Tax Reporting Contingency - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Trust Department Tax Reporting Contingency |  |
Estimated losses | $ 571,000 | $ 12,000
Accrued Interest and Other Liabilities |  |
Trust Department Tax Reporting Contingency |  |
Tax compliance matters | $ 322,000 |

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