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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Federal Home Loan Bank Advances (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 60 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2027 | Sep. 30, 2025 | Mar. 31, 2022 | Aug. 31, 2020 | Sep. 30, 2024 | Dec. 31, 2023 | May 31, 2024 | Jun. 30, 2024 | Aug. 30, 2020
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances |  |  |  |  | $ 21,000,000 | $ 79,530,000 |  |  |
Long-term debt, gross |  |  |  |  | 82,548,000 | 146,995,000 |  |  |
Banks available and unused portion of borrowing agreement |  |  |  |  | 414,369,000 | 370,569,000 |  |  |
Maximum month-end amounts outstanding |  |  |  |  | 81,000,000 | 217,530,000 |  |  |
Senior Notes - Variable Rate due June 2031 | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 5,000,000 |  |  |  |
Advances from FHLB |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Federal Home Loan Bank advances 2024 |  |  |  |  | 16,000,000 | 64,530,000 |  |  |
Federal Home Loan Bank advances 2025 |  |  |  |  | 5,000,000 | 5,000,000 |  |  |
Federal Home Loan Bank advances 2028 |  |  |  |  | 0 | 10,000,000 |  |  |
Federal Home Loan Bank advances |  |  |  |  | 21,000,000 | 79,530,000 |  |  |
FHLB advances |  |  |  |  | $ 1,081,967,000 | $ 1,106,267,000 |  |  |
Weighted-average interest rate (as a percent) |  |  |  |  | 3.28% | 4.16% |  |  |
Advances from FHLB | Minimum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Range of Stated Rates, 2024 (as a percent) |  |  |  |  | 1.45% | 0.00% |  |  |
Range of Stated Rates, 2025 (as a percent) |  |  |  |  | 1.45% | 1.45% |  |  |
Range of Stated Rates, 2028 (as a percent) |  |  |  |  | 0.00% | 3.82% |  |  |
Advances from FHLB | Maximum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Range of Stated Rates, 2024 (as a percent) |  |  |  |  | 4.94% | 5.45% |  |  |
Range of Stated Rates, 2025 (as a percent) |  |  |  |  | 1.45% | 1.45% |  |  |
Range of Stated Rates, 2028 (as a percent) |  |  |  |  | 0.00% | 3.82% |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 61,548,000 | $ 67,465,000 |  |  |
Unamortized debt issuance costs |  |  |  |  | (452,000) | (618,000) |  |  |
Senior Notes | Senior Notes due 2034 |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 12,000,000 | $ 18,083,000 |  |  |
Senior Notes | Senior Notes due 2034 | Prime Rate |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.75% |  |
Senior Notes | Senior Notes due 2034 | Minimum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 7.25% | 6.75% | 3.00% |  |
Senior Notes | Senior Notes due 2034 | Maximum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 7.75% | 7.75% |  |  |
Subordinated Notes |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 50,000,000 | $ 50,000,000 |  |  |
Subordinated Notes | Subordinated Notes due 2030 |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 15,000,000 | $ 15,000,000 |  |  |
Subordinated Notes | Subordinated Notes due 2030 | Minimum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 6.00% | 6.00% |  |  |
Subordinated Notes | Subordinated Notes due 2030 | Maximum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 6.00% | 6.00% |  |  |
Subordinated Notes | Subordinated Notes due 2032 |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 35,000,000 | $ 35,000,000 |  |  |
Subordinated Notes | Subordinated Notes due 2032 | Minimum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 4.75% | 4.75% |  |  |
Subordinated Notes | Subordinated Notes due 2032 | Maximum |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 4.75% | 4.75% |  |  |
Subordinated Notes | Subordinated Notes due 2030 |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  | 6.00%
Debt instrument, term (in years) |  |  |  | 5 years |  |  |  |  |
Subordinated Notes | Subordinated Notes due 2030 | Secured Overnight Financing Rate (SOFR) | Forecast |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 5.91% |  |  |  |  |  |  |
Subordinated Notes | Subordinated Notes due 2032 |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 4.75% |  |  |  |  |  |
Debt instrument, term (in years) |  |  | 5 years |  |  |  |  |  |
Subordinated Notes | Subordinated Notes due 2032 | Secured Overnight Financing Rate (SOFR) | Forecast |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.29% |  |  |  |  |  |  |  |
Federal Home Loan Bank Advances |  |  |  |  |  |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  | 3.82% |
FHLB, term notes |  |  |  |  |  |  |  | $ 10,000 |

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