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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Mar. 31, 2022 USD ($) Securities | Dec. 31, 2021 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 19,385 | $ 2,941
Fair Value, Less Than Twelve Months | 398,800 | 236,825
Gross Unrealized Losses, Twelve Months or More | 394 | 0
Fair Value, Twelve Months or More | 7,676 | 0
Total Unrealized Losses | $ 19,779 | $ 2,941
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 102 | 40
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 36 | 0
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 138 | 40
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 1,660 | $ 88
Fair Value, Less Than Twelve Months | 21,890 | 9,674
Gross Unrealized Losses, Twelve Months or More | 32 | 0
Fair Value, Twelve Months or More | 3,137 | 0
Total Unrealized Losses | 1,692 | 88
Auction rate money market preferred [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 |
Fair Value, Less Than Twelve Months | 0 |
Gross Unrealized Losses, Twelve Months or More | 333 |
Fair Value, Twelve Months or More | 2,867 |
Total Unrealized Losses | 333 |
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 2,491 | 10
Fair Value, Less Than Twelve Months | 104,218 | 11,165
Gross Unrealized Losses, Twelve Months or More | 0 | 0
Fair Value, Twelve Months or More | 0 | 0
Total Unrealized Losses | 2,491 | 10
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 13,657 | 2,676
Fair Value, Less Than Twelve Months | 218,268 | 209,703
Gross Unrealized Losses, Twelve Months or More | 0 | 0
Fair Value, Twelve Months or More | 0 | 0
Total Unrealized Losses | 13,657 | 2,676
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 371 | 167
Fair Value, Less Than Twelve Months | 6,079 | 6,283
Gross Unrealized Losses, Twelve Months or More | 29 | 0
Fair Value, Twelve Months or More | 1,672 | 0
Total Unrealized Losses | 400 | $ 167
Mortgage Backed Securities, Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 1,206 |
Fair Value, Less Than Twelve Months | 48,345 |
Gross Unrealized Losses, Twelve Months or More | 0 |
Fair Value, Twelve Months or More | 0 |
Total Unrealized Losses | $ 1,206 |

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