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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Mortgage Servicing Rights (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Balance of mortgage servicing rights | $ 3.1 | $ 3.2

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- Definition Mortgage servicing rights fair value disclosure. + References No definition available. + Details
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