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Fair Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract]    
Equity securities at fair value $ 3,529 $ 3,158
Mortgage servicing rights 7,792 7,665
Collateral dependent loans 8,322 8,397
Other real estate owned $ 0 $ 205
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 0.8255  
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 0.15
Mortgage servicing rights, measurement input 0.097 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, 2028
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, 2032
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, 2030
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 0.287 0.776
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 0.074 0.075
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 0.667
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 0.01 0.01
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 0.105 0.109
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 0.274 0.196
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 0.139 0.122
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   0.239
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   0.175