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CONTINGENCIES - Trust Department Tax Reporting Contingency (Details) - Trust Department Tax Reporting Contingency - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Trust Department Tax Reporting Contingency      
Loss Contingency, Loss in Period $ 107,000 $ 0  
Accrued Interest and Other Liabilities      
Trust Department Tax Reporting Contingency      
Tax compliance matters $ 429,000   $ 322,000