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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Dec. 31, 2023 USD ($) Securities | Dec. 31, 2022 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 159 | $ 19,424
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 11,736 | 306,801
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 32,699 | 26,092
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 467,719 | 244,918
Total Unrealized Losses | $ 32,858 | $ 45,516
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Securities | 22 | 178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Securities | 186 | 266
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Securities | 208 | 444
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 42 | $ 2,389
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 7,172 | 48,083
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,951 | 2,514
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 37,011 | 40,667
Total Unrealized Losses | 2,993 | 4,903
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 116 | 12,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,554 | 201,317
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 9,357 | 165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 173,221 | 4,411
Total Unrealized Losses | 9,473 | 12,573
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 1,388
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 18,331
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 16,417 | 21,533
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 214,801 | 190,370
Total Unrealized Losses | 16,417 | 22,921
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,200 | 1,022
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,950 | 7,128
Total Unrealized Losses | 1,200 | 1,022
Auction Rate Preferred Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 269 | 858
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,931 | 2,342
Total Unrealized Losses | 269 | 858
Collateralized Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 1 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 10 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,505 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 32,805 |
Total Unrealized Losses | $ 2,506 |
Mortgage Backed Securities, Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months |  | 3,239
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 39,070
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0
Total Unrealized Losses |  | $ 3,239

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