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FEDERAL HOME LOAN BANK AND FEDERAL RESERVE BANK ADVANCES AND OTHER BORROWINGS - Summary (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Aug. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2020
Summary of Federal Home Loan Bank advances |  |  |  |
Federal Home Loan Bank advances, net |  |  | $ 115,481,000 | $ 123,498,000
Long-term debt, gross |  |  | 173,835,000 | 181,826,000
Letters of credit outstanding, amount |  |  | 179,725,000 | 179,400,000
Banks available and unused portion of borrowing agreement |  |  | 122,791,000 | 118,391,000
Maximum month-end amounts outstanding |  |  | 123,530,000 | 162,530,000
Senior Notes - Variable Rate due June 2031 | Revolving Credit Facility |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Maximum borrowing capacity |  |  |  | 5,000,000
FHLB |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
FHLB advances, maturity 2021 |  |  | 4,000,000 | 8,000,000
FHLB advances, maturity 2022 |  |  | 11,000,000 | 15,000,000
FHLB advances, maturity 2023 |  |  | 20,000,000 | 20,000,000
FHLB advances, maturity 2024 |  |  | 20,530,000 | 20,530,000
FHLB advances, maturity 2025 |  |  | 5,000,000 | 5,000,000
FHLB advances, maturity 2029 |  |  | 42,500,000 | 42,500,000
FHLB advances, maturity 2030 |  |  | 12,500,000 | 12,500,000
FHLB advances, maturities summary |  |  | 115,530,000 | 123,530,000
Less: unamortized debt issuance costs |  |  | (49,000) | (32,000)
Federal Home Loan Bank advances, net |  |  | 115,481,000 | 123,498,000
Letters of credit outstanding, amount |  |  | $ 720,008,000 | $ 723,862,000
Weighted-average interest rate (as a percent) |  |  | 1.80% | 0.50%
FHLB | Minimum |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Range of stated rates, 2020 (as a percent) |  |  | 0.00% | 0.00%
Range of stated rates, 2021 (as a percent) |  |  | 2.45% | 2.34%
Range of stated rates, 2022 (as a percent) |  |  | 1.43% | 1.43%
Range of stated rates, 2023 (as a percent) |  |  | 0.00% | 0.00%
Range of stated rates, 2024 (as a percent) |  |  | 1.45% | 1.45%
Range of stated rates, 2029 (as a percent) |  |  | 1.00% | 1.00%
Range of stated rates, 2030 (as a percent) |  |  | 0.52% | 0.52%
FHLB | Maximum |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Range of stated rates, 2020 (as a percent) |  |  | 0.00% | 2.16%
Range of stated rates, 2021 (as a percent) |  |  | 2.45% | 2.45%
Range of stated rates, 2022 (as a percent) |  |  | 1.44% | 1.44%
Range of stated rates, 2023 (as a percent) |  |  | 1.45% | 1.45%
Range of stated rates, 2024 (as a percent) |  |  | 1.45% | 1.45%
Range of stated rates, 2029 (as a percent) |  |  | 1.13% | 1.13%
Range of stated rates, 2030 (as a percent) |  |  | 0.86% | 0.86%
Senior Notes |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Less: unamortized debt issuance costs |  |  | $ (502,000) | $ (528,000)
Long-term debt, gross |  |  | 58,354,000 | 58,328,000
Senior Notes | Senior Notes |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Long-term debt, gross |  |  | $ 28,856,000 | $ 28,856,000
Senior Notes | Senior Notes | Minimum |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Stated interest rate (as a percent) |  |  | 3.50% | 3.25%
Senior Notes | Senior Notes | Maximum |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Stated interest rate (as a percent) |  |  | 3.50% | 3.50%
Subordinated Notes |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Long-term debt, gross |  |  | $ 30,000,000 | $ 30,000,000
Subordinated Notes | Subordinated Notes due 2027 |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Long-term debt, gross |  |  | $ 15,000,000 | $ 15,000,000
Stated interest rate (as a percent) |  |  | 6.75% |
Debt instrument, term |  |  | 5 years |
Subordinated Notes | Subordinated Notes due 2027 | LIBOR | Forecast |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Basis spread on variable rate (as a percent) |  | 4.90% |  |
Subordinated Notes | Subordinated Notes due 2027 | Minimum |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Stated interest rate (as a percent) |  |  | 6.75% | 6.75%
Subordinated Notes | Subordinated Notes due 2027 | Maximum |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Stated interest rate (as a percent) |  |  | 6.75% | 6.75%
Subordinated Notes | Subordinated Notes due 2030 |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
Long-term debt, gross |  |  | $ 15,000,000 | $ 15,000,000
Stated interest rate (as a percent) |  |  | 6.00% |
Debt instrument, term |  |  | 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 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%
Federal Home Loan Bank Advances |  |  |  |
Summary of Federal Home Loan Bank advances |  |  |  |
FHLB, advances |  |  | $ 55,000,000 |

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