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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
	Apr. 30, 2027	Sep. 30, 2025	Jun. 30, 2019	Sep. 30, 2023	Dec. 31, 2022
Summary of Federal Home Loan Bank advances
Federal Home Loan Bank (“FHLB”)				$ 114,530,000	$ 142,530,000
Long-term debt, gross				181,937,000	214,939,000
Banks available and unused portion of borrowing agreement				314,521,000	256,773,000
Maximum month-end amounts outstanding				217,530,000	157,530,000
Senior Notes - Variable Rate Due June 2031 | Revolving Credit Facility
Summary of Federal Home Loan Bank advances
Maximum borrowing capacity				5,000,000
Federal Home Loan Bank advances
Summary of Federal Home Loan Bank advances
FHLB Advances, Maturity 2023				74,000,000	117,000,000
FHLB Advances, Maturity 2024				20,530,000	20,530,000
FHLB Advances, Maturity 2025				5,000,000	5,000,000
FHLB Advances, Maturity 2028				15,000,000
Federal Home Loan Bank (“FHLB”)				114,530,000	142,530,000
FHLB advances				$ 1,065,913,000	$ 984,878,000
Weighted-average interest rate (as a percent)				4.58%	4.09%
Federal Home Loan Bank advances | Minimum
Summary of Federal Home Loan Bank advances
Range of Stated Rates, 2023 (as a percent)				1.43%	1.43%
Range of Stated Rates, 2024 (as a percent)				0.00%	0.00%
Range of Stated Rates, 2025 (as a percent)				1.45%	1.45%
Range of Stated Rates , 2028 (as a percent)				3.57%
Federal Home Loan Bank advances | Maximum
Summary of Federal Home Loan Bank advances
Range of Stated Rates, 2023 (as a percent)				5.46%	4.31%
Range of Stated Rates, 2024 (as a percent)				1.45%	1.45%
Range of Stated Rates, 2025 (as a percent)				1.45%	1.45%
Range of Stated Rates , 2028 (as a percent)				3.59%
Senior Notes
Summary of Federal Home Loan Bank advances
Long-term debt, gross				$ 67,407,000	$ 72,409,000
Unamortized debt issuance costs				(676,000)	(841,000)
Senior Notes | Senior Notes, Due 2034
Summary of Federal Home Loan Bank advances
Long-term debt, gross				$ 18,083,000	$ 23,250,000
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)			3.00%	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%	6.75%
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
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%
Subordinated Notes | Subordinated Notes, Due 2032
Summary of Federal Home Loan Bank advances
Long-term debt, gross				$ 35,000,000	$ 35,000,000
Stated interest rate (as a percent)				4.75%
Debt instrument, term				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%
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%
Federal Home Loan Bank Advances
Summary of Federal Home Loan Bank advances
FHLB, term notes				$ 15,000

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