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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Securities
Dec. 31, 2022
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 159 $ 19,424
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 11,736 306,801
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 32,699 26,092
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 467,719 244,918
Total Unrealized Losses $ 32,858 $ 45,516
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | Securities 22 178
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | Securities 186 266
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | Securities 208 444
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 42 $ 2,389
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 7,172 48,083
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,951 2,514
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 37,011 40,667
Total Unrealized Losses 2,993 4,903
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 116 12,408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 4,554 201,317
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9,357 165
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 173,221 4,411
Total Unrealized Losses 9,473 12,573
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 1,388
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 18,331
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16,417 21,533
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 214,801 190,370
Total Unrealized Losses 16,417 22,921
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,200 1,022
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 6,950 7,128
Total Unrealized Losses 1,200 1,022
Auction Rate Preferred Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 269 858
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,931 2,342
Total Unrealized Losses 269 858
Collateralized Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 1  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 10  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,505  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 32,805  
Total Unrealized Losses $ 2,506  
Mortgage Backed Securities, Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   3,239
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months   39,070
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer   0
Total Unrealized Losses   $ 3,239