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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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