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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Mar. 31, 2023 USD ($) Securities | Dec. 31, 2022 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 4,981 | $ 19,424
Fair Value, Less Than Twelve Months | 128,887 | 306,799
Gross Unrealized Losses, Twelve Months or More | 32,496 | 26,092
Fair Value, Twelve Months or More | 371,315 | 244,917
Total Unrealized Losses | $ 37,477 | $ 45,516
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 68 | 178
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 138 | 266
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 206 | 444
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 726 | $ 2,389
Fair Value, Less Than Twelve Months | 20,459 | 48,083
Gross Unrealized Losses, Twelve Months or More | 2,661 | 2,514
Fair Value, Twelve Months or More | 25,924 | 40,667
Total Unrealized Losses | 3,387 | 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 | 484 | 858
Fair Value, Twelve Months or More | 2,716 | 2,342
Total Unrealized Losses | 484 | 858
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 4,212 | 12,408
Fair Value, Less Than Twelve Months | 106,964 | 201,316
Gross Unrealized Losses, Twelve Months or More | 6,041 | 165
Fair Value, Twelve Months or More | 87,195 | 4,411
Total Unrealized Losses | 10,253 | 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 | 19,435 | 21,533
Fair Value, Twelve Months or More | 212,086 | 190,369
Total Unrealized Losses | 19,435 | 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 | 1,070 | 1,022
Fair Value, Twelve Months or More | 7,080 | 7,128
Total Unrealized Losses | 1,070 | 1,022
Mortgage Backed Securities, Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 43 | 3,239
Fair Value, Less Than Twelve Months | 1,464 | 39,069
Gross Unrealized Losses, Twelve Months or More | 2,805 | 0
Fair Value, Twelve Months or More | 36,314 | 0
Total Unrealized Losses | $ 2,848 | $ 3,239

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