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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Securities
Dec. 31, 2021
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 27,846 $ 2,941
Fair Value, Less Than Twelve Months 464,416 236,825
Gross Unrealized Losses, Twelve Months or More 1,543 0
Fair Value, Twelve Months or More 18,793 0
Total Unrealized Losses $ 29,389 $ 2,941
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 144 40
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 80 0
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 224 40
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 3,081 $ 88
Fair Value, Less Than Twelve Months 39,328 9,674
Gross Unrealized Losses, Twelve Months or More 779 0
Fair Value, Twelve Months or More 14,657 0
Total Unrealized Losses 3,860 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 703  
Fair Value, Twelve Months or More 2,497  
Total Unrealized Losses 703  
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 5,239 10
Fair Value, Less Than Twelve Months 159,005 11,165
Gross Unrealized Losses, Twelve Months or More 0 0
Fair Value, Twelve Months or More 0 0
Total Unrealized Losses 5,239 10
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 17,350 2,676
Fair Value, Less Than Twelve Months 214,474 209,703
Gross Unrealized Losses, Twelve Months or More 0 0
Fair Value, Twelve Months or More 0 0
Total Unrealized Losses 17,350 2,676
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 487 167
Fair Value, Less Than Twelve Months 5,963 6,283
Gross Unrealized Losses, Twelve Months or More 61 0
Fair Value, Twelve Months or More 1,639 0
Total Unrealized Losses 548 $ 167
Mortgage Backed Securities, Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 1,689  
Fair Value, Less Than Twelve Months 45,646  
Gross Unrealized Losses, Twelve Months or More 0  
Fair Value, Twelve Months or More 0  
Total Unrealized Losses $ 1,689