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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Securities
Dec. 31, 2023
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 50 $ 159
Fair Value, Less Than Twelve Months 5,741 11,736
Gross Unrealized Losses, Twelve Months or More 20,984 32,699
Fair Value, Twelve Months or More 457,624 467,719
Total Unrealized Losses $ 21,034 $ 32,858
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 51 22
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 181 186
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 232 208
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 0 $ 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 10,080 16,417
Fair Value, Twelve Months or More 220,829 214,801
Total Unrealized Losses 10,080 16,417
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 50 42
Fair Value, Less Than Twelve Months 5,741 7,172
Gross Unrealized Losses, Twelve Months or More 2,711 2,951
Fair Value, Twelve Months or More 39,536 37,011
Total Unrealized Losses 2,761 2,993
Auction Rate Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 83 269
Fair Value, Twelve Months or More 3,117 2,931
Total Unrealized Losses 83 269
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 1
Fair Value, Less Than Twelve Months 0 10
Gross Unrealized Losses, Twelve Months or More 1,622 2,505
Fair Value, Twelve Months or More 28,955 32,805
Total Unrealized Losses 1,622 2,506
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 116
Fair Value, Less Than Twelve Months 0 4,554
Gross Unrealized Losses, Twelve Months or More 5,580 9,357
Fair Value, Twelve Months or More 157,945 173,221
Total Unrealized Losses 5,580 9,473
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 908 1,200
Fair Value, Twelve Months or More 7,242 6,950
Total Unrealized Losses $ 908 $ 1,200