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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Securities
Dec. 31, 2023
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 671 $ 159
Fair Value, Less Than Twelve Months 29,199 11,736
Gross Unrealized Losses, Twelve Months or More 25,825 32,699
Fair Value, Twelve Months or More 443,611 467,719
Total Unrealized Losses $ 26,496 $ 32,858
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 175 22
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 178 186
Number of Securities in an unrealized loss position. Total Unrealized Losses | Securities 353 208
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0 $ 0
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 10,236 16,417
Fair Value, Twelve Months or More 220,571 214,801
Total Unrealized Losses 10,236 16,417
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 486 42
Fair Value, Less Than Twelve Months 23,553 7,172
Gross Unrealized Losses, Twelve Months or More 4,090 2,951
Fair Value, Twelve Months or More 36,796 37,011
Total Unrealized Losses 4,576 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 156 269
Fair Value, Twelve Months or More 3,044 2,931
Total Unrealized Losses 156 269
Collateralized 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 2,182 2,505
Fair Value, Twelve Months or More 26,886 32,805
Total Unrealized Losses 2,182 2,506
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 185 116
Fair Value, Less Than Twelve Months 5,646 4,554
Gross Unrealized Losses, Twelve Months or More 8,297 9,357
Fair Value, Twelve Months or More 149,028 173,221
Total Unrealized Losses 8,482 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 864 1,200
Fair Value, Twelve Months or More 7,286 6,950
Total Unrealized Losses $ 864 $ 1,200