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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Securities
Dec. 31, 2023
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 87 $ 159
Fair Value, Less Than Twelve Months 14,350 11,736
Gross Unrealized Losses, Twelve Months or More 35,470 32,699
Fair Value, Twelve Months or More 468,337 467,719
Total Unrealized Losses $ 35,557 $ 32,858
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 40 22
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 218 186
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 258 208
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 16,888 16,417
Fair Value, Twelve Months or More 214,226 214,801
Total Unrealized Losses 16,888 16,417
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 86 42
Fair Value, Less Than Twelve Months 14,347 7,172
Gross Unrealized Losses, Twelve Months or More 3,818 2,951
Fair Value, Twelve Months or More 41,225 37,011
Total Unrealized Losses 3,904 2,993
Auction rate money market preferred [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 187 269
Fair Value, Twelve Months or More 3,013 2,931
Total Unrealized Losses 187 269
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 1 1
Fair Value, Less Than Twelve Months 3 10
Gross Unrealized Losses, Twelve Months or More 2,717 2,505
Fair Value, Twelve Months or More 31,041 32,805
Total Unrealized Losses 2,718 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 10,711 9,357
Fair Value, Twelve Months or More 171,831 173,221
Total Unrealized Losses 10,711 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 1,149 1,200
Fair Value, Twelve Months or More 7,001 6,950
Total Unrealized Losses $ 1,149 $ 1,200