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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, 2023
USD ($)
Dec. 31, 2022
USD ($)
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value $ 2,900 $ 2,166
Mortgage servicing rights 8,289 8,468
Collateral dependent loans   2,703
Other real estate owned $ 623 $ 570
Conversion Rate [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input 1.5875  
Dividend Rate [Member]    
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value, measurement input 0.7144  
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 0.15 0.08
Mortgage servicing rights, measurement input 0.095 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 0.25 0.12
Mortgage servicing rights, measurement input 0.12 0.12
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 0.20 0.10
Mortgage servicing rights, measurement input 0.10 0.10
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, 2028 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, 2032 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, 2030 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 0.065
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 0.776 0.28
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 0.072 0.071
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 0.667 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 0.008 0.012
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   0.52
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   0.52
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   0.52
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 0.10 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 0.273 0.306
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 0.14 0.109