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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Summary of Advances from the FHLB (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fixed rate: |  |
Outstanding balance | $ 1,030,000 | $ 550,000
Variable rate: |  |
Outstanding balance | $ 775,000 | $ 1,145,000
Weighted average interest rate | 2.07% | 1.40%
Minimum |  |
Fixed rate: |  |
Interest rate | 1.23% | 1.23%
Maximum |  |
Fixed rate: |  |
Interest rate | 3.32% | 3.00%
Weighted Average |  |
Fixed rate: |  |
Interest rate | 2.40% | 2.02%

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