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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

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