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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Sep. 30, 2021 USD ($) Securities
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Debt Securities, Available-for-sale [Line Items] |
Gross Unrealized Losses, Less Than Twelve Months | $ 702
Fair Value, Less Than Twelve Months | 180,960
Gross Unrealized Losses, Twelve Months or More | 0
Fair Value, Twelve Months or More | 0
Total Unrealized Losses | $ 702
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 37
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 0
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 37
States and political subdivisions [Member] |
Debt Securities, Available-for-sale [Line Items] |
Gross Unrealized Losses, Less Than Twelve Months | $ 98
Fair Value, Less Than Twelve Months | 14,939
Gross Unrealized Losses, Twelve Months or More | 0
Fair Value, Twelve Months or More | 0
Total Unrealized Losses | 98
US Treasury Securities |
Debt Securities, Available-for-sale [Line Items] |
Gross Unrealized Losses, Less Than Twelve Months | 523
Fair Value, Less Than Twelve Months | 161,652
Gross Unrealized Losses, Twelve Months or More | 0
Fair Value, Twelve Months or More | 0
Total Unrealized Losses | 523
Corporate Debt Securities |
Debt Securities, Available-for-sale [Line Items] |
Gross Unrealized Losses, Less Than Twelve Months | 81
Fair Value, Less Than Twelve Months | 4,369
Gross Unrealized Losses, Twelve Months or More | 0
Fair Value, Twelve Months or More | 0
Total Unrealized Losses | $ 81

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