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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Federal Home Loan Bank Advances (Details) - USD ($)	1 Months Ended				12 Months Ended
	Apr. 30, 2027	Sep. 30, 2025	Aug. 31, 2022	Jun. 30, 2019	Dec. 31, 2023	Dec. 31, 2022
Summary of Federal Home Loan Bank advances
Federal Home Loan Bank advances					$ 79,530,000	$ 142,530,000
Long-term debt, gross					146,995,000	214,939,000
Banks available and unused portion of borrowing agreement					370,569,000	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
Advances from FHLB
Summary of Federal Home Loan Bank advances
Federal Home Loan Bank advances, Maturity 2023					0	117,000,000
Federal Home Loan Bank advances, Maturity 202					64,530,000	20,530,000
Federal Home Loan Bank advances, Maturity 2025					5,000,000	5,000,000
Federal Home Loan Bank advances, Maturity 2028					10,000,000	0
Federal Home Loan Bank advances					79,530,000	142,530,000
FHLB advances					$ 1,106,267,000	$ 984,878,000
Weighted average interest rate (as a percent)					4.16%	4.09%
Advances from FHLB | Minimum
Summary of Federal Home Loan Bank advances
Range of Stated Rates, 2023 (as a percent)					0.00%	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)					3.82%	0.00%
Advances from FHLB | Maximum
Summary of Federal Home Loan Bank advances
Range of Stated Rates, 2023 (as a percent)					0.00%	4.31%
Range of Stated Rates, 2024 (as a percent)					5.45%	1.45%
Range of Stated Rates, 2025 (as a percent)					1.45%	1.45%
Range of Stated Rates, 2028 (as a percent)					3.82%	0.00%
Senior notes
Summary of Federal Home Loan Bank advances
Long-term debt, gross					$ 67,465,000	$ 72,409,000
Unamortized discount (premium) and debt issuance costs					(618,000)	(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 | Minimum
Summary of Federal Home Loan Bank advances
Stated interest rate (as a percent)					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%
Senior notes | Senior Notes due 2031 | Prime Rate
Summary of Federal Home Loan Bank advances
Debt instrument, basis spread on variable rate (as a percent)				0.75%
Senior notes | Senior Notes due 2031 | Minimum
Summary of Federal Home Loan Bank advances
Stated interest rate (as a percent)					3.00%
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)					6.75%
Debt instrument, term					5 years
Subordinated notes | Subordinated Notes due 2030 | LIBOR
Summary of Federal Home Loan Bank advances
Debt instrument, basis spread on variable rate (as a percent)			4.90%
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)					6.00%
Debt instrument, term					5 years
Subordinated notes | Subordinated Notes due 2032 | Secured Overnight Financing Rate (SOFR) | Forecast
Summary of Federal Home Loan Bank advances
Debt instrument, basis spread on variable rate (as a percent)		5.91%
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 March 2032
Summary of Federal Home Loan Bank advances
Stated interest rate (as a percent)					4.75%
Debt instrument, term					5 years
Subordinated notes | Subordinated Notes due March 2032 | Secured Overnight Financing Rate (SOFR) | Forecast
Summary of Federal Home Loan Bank advances
Debt instrument, basis spread on variable rate (as a percent)	3.29%
Federal Home Loan Bank Advances
Summary of Federal Home Loan Bank advances
FHLB, advances, maturity 2029 and 2030					$ 10,000	$ 0

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