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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 539,695 $ 559,974
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 464 1,032
Gross Unrealized Losses 34,513 32,858
AFS securities 505,646 528,148
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 231,012 231,218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 15,679 16,417
AFS securities 215,333 214,801
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 86,789 94,837
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 464 1,032
Gross Unrealized Losses 4,202 2,993
AFS securities 83,051 92,876
Auction Rate Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,200 3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 192 269
AFS securities 3,008 2,931
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 32,120 35,321
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 2,579 2,506
AFS securities 29,541 32,815
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 178,424 187,248
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 10,715 9,473
AFS securities 167,709 177,775
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 8,150 8,150
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 1,146 1,200
AFS securities $ 7,004 $ 6,950