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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
	Sep. 01, 2025	Apr. 30, 2027	Sep. 30, 2025	Mar. 31, 2022	Aug. 31, 2020	Sep. 30, 2025	Dec. 31, 2024	May 31, 2024	Aug. 30, 2020
Summary of Federal Home Loan Bank advances
Federal Home Loan Bank advances			$ 0			$ 0	$ 5,000,000
Long-term debt, gross			46,762,000			46,762,000	66,606,000
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
Senior Notes - Variable Rate due June 2031 | Revolving Credit Facility
Summary of Federal Home Loan Bank advances
Maximum borrowing capacity			5,000,000			5,000,000
Advances from FHLB
Summary of Federal Home Loan Bank advances
Federal Home Loan Bank advances 2025			0			0	5,000,000
Federal Home Loan Bank advances			0			0	5,000,000
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 | Minimum
Summary of Federal Home Loan Bank advances
Range of Stated Rates, 2025 (as a percent)			0.00%			0.00%	1.45%
Advances from FHLB | Maximum
Summary of Federal Home Loan Bank advances
Range of Stated Rates, 2025 (as a percent)			0.00%			0.00%	1.45%
Senior Notes
Summary of Federal Home Loan Bank advances
Long-term debt, gross			$ 46,762,000			$ 46,762,000	$ 61,606,000
Unamortized debt issuance costs			(238,000)			(238,000)	(394,000)
Senior Notes | Senior Notes due 2039
Summary of Federal Home Loan Bank advances
Long-term debt, gross			$ 12,000,000			$ 12,000,000	$ 12,000,000
Senior Notes | Senior Notes due 2039 | Prime Rate
Summary of Federal Home Loan Bank advances
Basis spread on variable rate (as a percent)								0.75%
Senior Notes | Senior Notes due 2039 | Minimum
Summary of Federal Home Loan Bank advances
Stated interest rate (as a percent)			6.50%			6.50%	6.75%	3.00%
Senior Notes | Senior Notes due 2039 | Maximum
Summary of Federal Home Loan Bank advances
Stated interest rate (as a percent)			6.50%			6.50%	7.75%
Subordinated Notes
Summary of Federal Home Loan Bank advances
Long-term debt, gross			$ 35,000,000			$ 35,000,000	$ 50,000,000
Subordinated Notes | Subordinated Notes due 2030
Summary of Federal Home Loan Bank advances
Long-term debt, gross			$ 0			$ 0	$ 15,000,000
Subordinated Notes | Subordinated Notes due 2030 | Minimum
Summary of Federal Home Loan Bank advances
Stated interest rate (as a percent)			0.00%			0.00%	6.00%
Subordinated Notes | Subordinated Notes due 2030 | Maximum
Summary of Federal Home Loan Bank advances
Stated interest rate (as a percent)			0.00%			0.00%	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	$ 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%	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%	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
Stock redeemed or called during period, value	$ 15,000
Subordinated Notes | Subordinated Notes due 2030 | Secured Overnight Financing Rate (SOFR)
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%

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