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AFS Securities (Amortized cost and fair value of AFS securities by contractual maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less $ 25,095  
Maturing, After One Year But Within Five Years 248,760  
Maturing, After Five Years But Within Ten Years 28,063  
Maturing, After Ten Years 30,915  
Securities With Variable Monthly Payments or Noncontractual Maturities 219,504  
Amortized Cost 552,337 $ 559,974
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less, Fair value 25,158  
Maturing, After One Year But Within Five Years, Fair value 232,115  
Maturing, After Five Years But Within Ten Years, Fair value 26,197  
Maturing, After Ten Years, Fair value 28,227  
Securities With Variable Monthly Payments or Noncontractual Maturities, Fair value 205,888  
Total, Fair value 517,585 528,148
US Treasury Securities    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 9,990  
Maturing, After One Year But Within Five Years 221,124  
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 231,114 231,218
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 214,226 214,801
States and political subdivisions [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 15,105  
Maturing, After One Year But Within Five Years 27,636  
Maturing, After Five Years But Within Ten Years 19,913  
Maturing, After Ten Years 30,915  
Securities With Variable Monthly Payments or Noncontractual Maturities 0  
Amortized Cost 93,569 94,837
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 90,470 92,876
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 3,013 2,931
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 33,762  
Amortized Cost 33,762 35,321
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 31,044 32,815
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 182,542  
Amortized Cost 182,542 187,248
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 171,831 177,775
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 $ 7,001 $ 6,950