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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 60 Months Ended
Apr. 30, 2027
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
May 31, 2024
Jun. 30, 2024
Summary of Federal Home Loan Bank advances            
Federal Home Loan Bank advances     $ 5,000,000 $ 79,530,000    
Long-term debt, gross     66,606,000 146,995,000    
Banks available and unused portion of borrowing agreement     424,658,000 370,569,000    
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      
Advances from FHLB            
Summary of Federal Home Loan Bank advances            
Federal Home Loan Bank advances, Maturity 2023     0 64,530,000    
Federal Home Loan Bank advances, Maturity 202     5,000,000 5,000,000    
Federal Home Loan Bank advances, Maturity 2025     10,000,000    
Federal Home Loan Bank advances, Maturity 2028        
Federal Home Loan Bank advances     5,000,000 79,530,000    
FHLB advances     $ 1,075,001,000 $ 1,106,267,000    
Weighted average interest rate (as a percent)     1.45% 4.16%    
Advances from FHLB | Minimum            
Summary of Federal Home Loan Bank advances            
Range of Stated Rates, 2023 (as a percent)     0.00% 0.00%    
Range of Stated Rates, 2024 (as a percent)     1.45% 1.45%    
Range of Stated Rates, 2025 (as a percent)     3.82%    
Range of Stated Rates, 2028 (as a percent)        
Advances from FHLB | Maximum            
Summary of Federal Home Loan Bank advances            
Range of Stated Rates, 2023 (as a percent)     0.00% 5.45%    
Range of Stated Rates, 2024 (as a percent)     1.45% 1.45%    
Range of Stated Rates, 2025 (as a percent)     3.82%    
Range of Stated Rates, 2028 (as a percent)        
Senior notes            
Summary of Federal Home Loan Bank advances            
Long-term debt, gross     $ 61,606,000 $ 67,465,000    
Unamortized discount (premium) and debt issuance costs     (394,000) (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            
Debt instrument, 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)     6.75% 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%    
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    
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            
Stated interest rate (as a percent)           3.82%
FHLB, advances, maturity 2029 and 2030           $ 10,000