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FEDERAL HOME LOAN BANK ADVANCES, FEDERAL RESERVE BANK BORROWINGS AND OTHER BORROWINGS - Summary of Advances From the FHLB (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fixed rate: |  |
Outstanding balance | $ 811,000 | $ 711,000
Variable rate: |  |
Outstanding balance | $ 0 | $ 20,000
Weighted average interest rate (percent) | 0.00% | 4.59%
Unamortized debt issuance costs | $ 2,700 | $ 3,700
Minimum |  |
Fixed rate: |  |
Interest rate (percent) | 0.64% | 0.64%
Maximum |  |
Fixed rate: |  |
Interest rate (percent) | 3.70% | 3.70%
Weighted average (percent) |  |
Fixed rate: |  |
Interest rate (percent) | 3.04% | 2.97%

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- Definition Federal Home Loan Bank, Advances, General Debt Obligations, Disclosure, Weighted Average Interest Rate, Variable + References No definition available. + Details
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- Definition Amount of unearned commitment fees on advances made and reported by Federal Home Loan Bank (FHLBank). + References No definition available. + Details
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