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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Federal Home Loan Bank Advances (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended
Apr. 30, 2027
Sep. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
May 31, 2024
Summary of Federal Home Loan Bank advances          
Federal Home Loan Bank advances     $ 31,500,000 $ 79,530,000  
Long-term debt, gross     92,998,000 146,995,000  
Banks available and unused portion of borrowing agreement     416,063,000 370,569,000  
Maximum month-end amounts outstanding     81,000,000 217,530,000  
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     26,500,000 64,530,000  
Federal Home Loan Bank advances 2025     5,000,000 5,000,000  
Federal Home Loan Bank advances 2028     0 10,000,000  
Federal Home Loan Bank advances     31,500,000 79,530,000  
FHLB advances     $ 1,099,969,000 $ 1,106,267,000  
Weighted-average interest rate (as a percent)     3.54% 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)     0.00% 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)     0.00% 3.82%  
Senior Notes          
Summary of Federal Home Loan Bank advances          
Long-term debt, gross     $ 61,498,000 $ 67,465,000  
Unamortized debt issuance costs     (502,000) (618,000)  
Senior Notes | Senior Notes due 2034          
Summary of Federal Home Loan Bank advances          
Long-term debt, gross     $ 12,000,000 $ 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)     7.75% 6.75% 3.00%
Stated interest rate (as a percent)     7.75% 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% 7.75%  
Stated interest rate (as a percent)     7.75% 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%  
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%  
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%  
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%  
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%    
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%    
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          
Stated interest rate (as a percent)     3.82%    
FHLB, term notes     $ 10,000    
Stated interest rate (as a percent)     3.82%