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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, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 574,716 $ 625,605
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 757 392
Gross Unrealized Losses 44,976 45,516
AFS securities 530,497 580,481
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 99,231 122,023
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 757 392
Gross Unrealized Losses 4,746 4,903
AFS securities 95,242 117,512
Auction rate money market preferred [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 563 858
AFS securities 2,637 2,342
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 38,731 42,309
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 3,199 3,239
AFS securities 35,532 39,070
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 193,983 218,301
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 12,987 12,573
AFS securities 180,996 205,728
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 1,413 1,022
AFS securities 6,737 7,128
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 231,421 231,622
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 22,068 22,921
AFS securities $ 209,353 $ 208,701