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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Securities
Dec. 31, 2022
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 1,257 $ 19,424
Fair Value, Less Than Twelve Months 28,874 306,799
Gross Unrealized Losses, Twelve Months or More 50,020 26,092
Fair Value, Twelve Months or More 475,904 244,918
Total Unrealized Losses $ 51,277 $ 45,516
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 67 178
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 400 266
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 467 444
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 962 $ 2,389
Fair Value, Less Than Twelve Months 24,474 48,083
Gross Unrealized Losses, Twelve Months or More 6,657 2,514
Fair Value, Twelve Months or More 53,180 40,667
Total Unrealized Losses 7,619 4,903
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 630 858
Fair Value, Twelve Months or More 2,570 2,342
Total Unrealized Losses 630 858
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 294 12,408
Fair Value, Less Than Twelve Months 4,362 201,315
Gross Unrealized Losses, Twelve Months or More 15,263 165
Fair Value, Twelve Months or More 171,268 4,411
Total Unrealized Losses 15,557 12,573
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 1,388
Fair Value, Less Than Twelve Months 0 18,331
Gross Unrealized Losses, Twelve Months or More 22,136 21,533
Fair Value, Twelve Months or More 209,182 190,370
Total Unrealized Losses 22,136 22,921
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 1,331 1,022
Fair Value, Twelve Months or More 6,819 7,128
Total Unrealized Losses 1,331 1,022
Mortgage Backed Securities, Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 1 3,239
Fair Value, Less Than Twelve Months 38 39,070
Gross Unrealized Losses, Twelve Months or More 4,003 0
Fair Value, Twelve Months or More 32,885 0
Total Unrealized Losses $ 4,004 $ 3,239