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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Sep. 30, 2022 USD ($) Securities | Dec. 31, 2021 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 28,926 | $ 2,941
Fair Value, Less Than Twelve Months | 372,655 | 236,825
Gross Unrealized Losses, Twelve Months or More | 22,707 | 0
Fair Value, Twelve Months or More | 194,643 | 0
Total Unrealized Losses | $ 51,633 | $ 2,941
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 249 | 40
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 305 | 0
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 554 | 40
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 4,192 | $ 88
Fair Value, Less Than Twelve Months | 57,140 | 9,674
Gross Unrealized Losses, Twelve Months or More | 3,333 | 0
Fair Value, Twelve Months or More | 42,925 | 0
Total Unrealized Losses | 7,525 | 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 | 721 |
Fair Value, Twelve Months or More | 2,479 |
Total Unrealized Losses | 721 |
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 13,461 | 10
Fair Value, Less Than Twelve Months | 209,720 | 11,165
Gross Unrealized Losses, Twelve Months or More | 0 | 0
Fair Value, Twelve Months or More | 0 | 0
Total Unrealized Losses | 13,461 | 10
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 6,996 | 2,676
Fair Value, Less Than Twelve Months | 62,985 | 209,703
Gross Unrealized Losses, Twelve Months or More | 17,936 | 0
Fair Value, Twelve Months or More | 143,806 | 0
Total Unrealized Losses | 24,932 | 2,676
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 232 | 167
Fair Value, Less Than Twelve Months | 1,768 | 6,283
Gross Unrealized Losses, Twelve Months or More | 717 | 0
Fair Value, Twelve Months or More | 5,433 | 0
Total Unrealized Losses | 949 | $ 167
Mortgage Backed Securities, Other [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 4,045 |
Fair Value, Less Than Twelve Months | 41,042 |
Gross Unrealized Losses, Twelve Months or More | 0 |
Fair Value, Twelve Months or More | 0 |
Total Unrealized Losses | $ 4,045 |

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