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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