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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Federal Home Loan Bank Advances (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2027
Sep. 30, 2025
Jun. 30, 2019
Mar. 31, 2024
Dec. 31, 2023
Summary of Federal Home Loan Bank advances          
Federal Home Loan Bank advances       $ 39,500,000 $ 79,530,000
Long-term debt, gross       107,023,000 146,995,000
Banks available and unused portion of borrowing agreement       397,182,000 370,569,000
Maximum month-end amounts outstanding       64,000,000 217,530,000
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 2024       24,500,000 64,530,000
Federal Home Loan Bank advances 2025       5,000,000 5,000,000
Federal Home Loan Bank advances 2028       10,000,000 10,000,000
Federal Home Loan Bank advances       39,500,000 79,530,000
FHLB advances       $ 1,115,197,000 $ 1,106,267,000
Weighted-average interest rate (as a percent)       2.73% 4.16%
Advances from FHLB | Minimum          
Summary of Federal Home Loan Bank advances          
Range of Stated Rates, 2024 (as a percent)       1.44% 0.00%
Range of Stated Rates, 2025 (as a percent)       1.45% 1.45%
Range of Stated Rates, 2028 (as a percent)       3.82% 3.82%
Advances from FHLB | Maximum          
Summary of Federal Home Loan Bank advances          
Range of Stated Rates, 2024 (as a percent)       5.45% 5.45%
Range of Stated Rates, 2025 (as a percent)       1.45% 1.45%
Range of Stated Rates, 2028 (as a percent)       3.82% 3.82%
Senior Notes          
Summary of Federal Home Loan Bank advances          
Long-term debt, gross       $ 67,523,000 $ 67,465,000
Unamortized debt issuance costs       (560,000) (618,000)
Senior Notes | Senior Notes, Due 2034          
Summary of Federal Home Loan Bank advances          
Long-term debt, gross       $ 18,083,000 $ 18,083,000
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% 6.75%
Senior Notes | Senior Notes, Due 2034 | Maximum          
Summary of Federal Home Loan Bank advances          
Stated interest rate (as a percent)       7.50% 7.75%
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
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
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 2030          
Summary of Federal Home Loan Bank advances          
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 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 2032 | Secured Overnight Financing Rate (SOFR) | Forecast          
Summary of Federal Home Loan Bank advances          
Basis spread on variable rate (as a percent) 3.29%        
Federal Home Loan Bank Advances          
Summary of Federal Home Loan Bank advances          
FHLB, term notes       $ 10,000