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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Sep. 30, 2023 USD ($) Securities | Dec. 31, 2022 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 1,257 | $ 19,424
Fair Value, Less Than Twelve Months | 28,874 | 306,799
Gross Unrealized Losses, Twelve Months or More | 50,020 | 26,092
Fair Value, Twelve Months or More | 475,904 | 244,918
Total Unrealized Losses | $ 51,277 | $ 45,516
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 67 | 178
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 400 | 266
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 467 | 444
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 962 | $ 2,389
Fair Value, Less Than Twelve Months | 24,474 | 48,083
Gross Unrealized Losses, Twelve Months or More | 6,657 | 2,514
Fair Value, Twelve Months or More | 53,180 | 40,667
Total Unrealized Losses | 7,619 | 4,903
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 | 630 | 858
Fair Value, Twelve Months or More | 2,570 | 2,342
Total Unrealized Losses | 630 | 858
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 294 | 12,408
Fair Value, Less Than Twelve Months | 4,362 | 201,315
Gross Unrealized Losses, Twelve Months or More | 15,263 | 165
Fair Value, Twelve Months or More | 171,268 | 4,411
Total Unrealized Losses | 15,557 | 12,573
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 1,388
Fair Value, Less Than Twelve Months | 0 | 18,331
Gross Unrealized Losses, Twelve Months or More | 22,136 | 21,533
Fair Value, Twelve Months or More | 209,182 | 190,370
Total Unrealized Losses | 22,136 | 22,921
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 | 1,331 | 1,022
Fair Value, Twelve Months or More | 6,819 | 7,128
Total Unrealized Losses | 1,331 | 1,022
Mortgage Backed Securities, Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 1 | 3,239
Fair Value, Less Than Twelve Months | 38 | 39,070
Gross Unrealized Losses, Twelve Months or More | 4,003 | 0
Fair Value, Twelve Months or More | 32,885 | 0
Total Unrealized Losses | $ 4,004 | $ 3,239

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