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FEDERAL HOME LOAN BANK ADVANCES - Narrative (Details) - USD ($) $ in Billions | Sep. 30, 2020 | Dec. 31, 2019
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FEDERAL HOME LOAN BANK ADVANCES. |  |
Advances collateralized amount | $ 1.6 | $ 1.4
Maximum borrowing amount from FHLB term advances | $ 1.9 |

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