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FEDERAL HOME LOAN BANK AND FEDERAL RESERVE BANK ADVANCES AND OTHER BORROWINGS - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding, amount | $ 179,725,000 |  | $ 179,400,000
Line of Credit | Federal Reserve Bank Paycheck Protection Program Liquidity Facility |  |  |
Debt Instrument [Line Items] |  |  |
Remaining borrowing capacity | 118,931,000 |  |
Outstanding balances of debt instrument | 0 |  | $ 0
Maximum month-end outstanding amount | $ 0 | $ 25,136,000 |

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