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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Dec. 31, 2022 USD ($) Securities | Dec. 31, 2021 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 19,424 | $ 2,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 306,799 | 236,825
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 26,092 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 244,917 | 0
Total Unrealized Losses | $ 45,516 | $ 2,941
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Securities | 266 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Securities | 444 | 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Securities | 178 | 40
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 2,389 | $ 88
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 48,083 | 9,674
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,514 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 40,667 | 0
Total Unrealized Losses | 4,903 | 88
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 12,408 | 10
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 201,316 | 11,165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 165 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4,411 | 0
Total Unrealized Losses | 12,573 | 10
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 1,388 | 2,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 18,331 | 209,703
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 21,533 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 190,369 | 0
Total Unrealized Losses | 22,921 | 2,676
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 167
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 6,283
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,022 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7,128 | 0
Total Unrealized Losses | 1,022 | $ 167
Auction Rate Preferred Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 858 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,342 |
Total Unrealized Losses | 858 |
Collateralized Mortgage Backed Securities [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 | 39,069 |
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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