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AFS Securities (Amortized cost and fair value of AFS securities by contractual maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less $ 11,998  
Maturing, After One Year But Within Five Years 263,144  
Maturing, After Five Years But Within Ten Years 28,957  
Maturing, After Ten Years 32,411  
Securities With Variable Monthly Payments or Noncontractual Maturities 231,314  
Amortized Cost 567,824 $ 625,605
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less, Fair value 11,945  
Maturing, After One Year But Within Five Years, Fair value 240,395  
Maturing, After Five Years But Within Ten Years, Fair value 25,832  
Maturing, After Ten Years, Fair value 27,602  
Securities With Variable Monthly Payments or Noncontractual Maturities, Fair value 211,123  
Total, Fair value 516,897 580,481
States and political subdivisions [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 11,998  
Maturing, After One Year But Within Five Years 31,826  
Maturing, After Five Years But Within Ten Years 20,807  
Maturing, After Ten Years 32,411  
Securities With Variable Monthly Payments or Noncontractual Maturities 0  
Amortized Cost 97,042 122,023
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 89,773 117,512
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 3,200  
Amortized Cost 3,200 3,200
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 2,570 2,342
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 36,927  
Amortized Cost 36,927 42,309
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 32,923 39,070
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 191,187  
Amortized Cost 191,187 218,301
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 175,630 205,728
Corporate Debt Securities    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 8,150  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 0  
Amortized Cost 8,150 8,150
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 6,819 7,128
US Treasury Securities    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 231,318  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 0  
Amortized Cost 231,318 231,622
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value $ 209,182 $ 208,701