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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Jun. 30, 2024 USD ($) Securities | Dec. 31, 2023 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 379 | $ 159
Fair Value, Less Than Twelve Months | 26,922 | 11,736
Gross Unrealized Losses, Twelve Months or More | 34,134 | 32,699
Fair Value, Twelve Months or More | 463,166 | 467,719
Total Unrealized Losses | $ 34,513 | $ 32,858
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 210 | 22
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 198 | 186
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 408 | 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 | 15,679 | 16,417
Fair Value, Twelve Months or More | 215,333 | 214,801
Total Unrealized Losses | 15,679 | 16,417
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 379 | 42
Fair Value, Less Than Twelve Months | 26,922 | 7,172
Gross Unrealized Losses, Twelve Months or More | 3,823 | 2,951
Fair Value, Twelve Months or More | 40,571 | 37,011
Total Unrealized Losses | 4,202 | 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 | 192 | 269
Fair Value, Twelve Months or More | 3,008 | 2,931
Total Unrealized Losses | 192 | 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 | 2,579 | 2,505
Fair Value, Twelve Months or More | 29,541 | 32,805
Total Unrealized Losses | 2,579 | 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 | 10,715 | 9,357
Fair Value, Twelve Months or More | 167,709 | 173,221
Total Unrealized Losses | 10,715 | 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 | 1,146 | 1,200
Fair Value, Twelve Months or More | 7,004 | 6,950
Total Unrealized Losses | $ 1,146 | $ 1,200

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