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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
Securities
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