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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Narrative (Details) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 01, 2025 USD ($) | Sep. 30, 2025 USD ($) | Aug. 31, 2020 | Sep. 30, 2025 USD ($) fund | Dec. 31, 2024 USD ($) | May 31, 2024 | Aug. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Banks available and unused portion of borrowing agreement |  | $ 414,386,000 |  | $ 414,386,000 | $ 424,658,000 |  |
Maximum month-end amounts outstanding |  |  |  | 5,000,000 | 81,000,000 |  |
Revolving Credit Facility | Senior Notes - Variable Rate due June 2031 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 5,000,000 |  | $ 5,000,000 |  |  |
Line of credit facility, renewal term |  |  |  | 1 year |  |  |
Advances from FHLB |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | 24,784,000 |  | $ 24,784,000 | 24,942,000 |  |
Long-term line of credit |  | 32,596,000 |  | 32,596,000 | 33,994,000 |  |
Federal reserve borrowings outstanding |  |  |  | 0 | 0 |  |
Unsecured Federal Funds Purchased |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term line of credit |  | 70,000,000 |  | $ 70,000,000 | 70,000,000 |  |
Number of unsecured federal funds | fund |  |  |  | 2 |  |  |
Unsecured Federal Funds Purchased | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding balances of debt instrument |  | 0 |  | $ 0 | 0 |  |
Advances from FHLB |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB advances |  | $ 1,028,745,000 |  | $ 1,028,745,000 | $ 1,075,001,000 |  |
Weighted-average interest rate (as a percent) |  | 0.00% |  | 0.00% | 1.45% |  |
Advances from FHLB | Letter of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | $ 198,700,000 |  | $ 198,700,000 | $ 209,750,000 |  |
Subordinated Notes | Subordinated Notes due 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 6.00%
Renewed, term (in years) |  |  | 5 years |  |  |  |
Stock redeemed or called during period, value | $ 15,000 |  |  |  |  |  |
Subordinated Notes | Subordinated Notes due 2030 | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 5.91% |  |  |  |  |
Senior Notes | Senior Notes due 2039 | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 6.50% |  | 6.50% | 6.75% | 3.00% |
Senior Notes | Senior Notes due 2039 | Prime Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 0.75% |

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