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Fair Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value $ 3,961 $ 3,781
Mortgage servicing rights 6,874 7,357
Collateral dependent loans 7,347 8,310
Other real estate owned $ 148 $ 731
Conversion Rate [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input 1.5549  
Dividend Rate [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input 0.9174  
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input 0.08 0.08
Mortgage servicing rights, measurement input 0.093 0.095
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input 0.12 0.12
Mortgage servicing rights, measurement input 0.115 0.123
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input 0.10 0.10
Mortgage servicing rights, measurement input 0.097 0.101
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input, conversion date Dec. 31, 2026 Dec. 31, 2025
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input, conversion date Dec. 31, 2030 Dec. 31, 2029
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input, conversion date Dec. 31, 2028 Dec. 31, 2027
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0 0
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.223 0.212
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.066 0.066
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Cost to Service [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, cost to service $ 0 $ 0
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Cost to Service [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, cost to service 567 435
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Cost to Service [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, cost to service $ 76 $ 76
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0 0
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 1 1
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Mortgage servicing rights, measurement input 0.012 0.017
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Collateral dependent loans, measurement input 0.188 0.115
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Collateral dependent loans, measurement input 0.23 0.189
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Collateral dependent loans, measurement input 0.197 0.126
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Minimum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Other real estate owned, measurement input 0 0.10
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Maximum [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Other real estate owned, measurement input 0.10 0.5853
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Weighted Average [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Other real estate owned, measurement input 0.091 0.422