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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Summary of Advances from the FHLB (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fixed rate: |  |
Outstanding balance | $ 1,180,000 | $ 805,000
Variable rate: |  |
Outstanding balance | $ 645,000 | $ 715,000
Weighted average interest rate (percent) | 2.52% | 2.56%
Minimum |  |
Fixed rate: |  |
Interest rate (percent) | 1.61% | 1.61%
Maximum |  |
Fixed rate: |  |
Interest rate (percent) | 3.32% | 3.32%
Weighted average (percent) |  |
Fixed rate: |  |
Interest rate (percent) | 2.51% | 2.58%

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