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Securities - Unrealized Losses Held-to-Maturity Debt Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Fair Value    
Less than 12 Months $ 0 $ 0
12 Months or Longer 265,102 267,455
Fair Value 265,102 267,455
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 47,313 44,946
Unrealized Losses 47,313 44,946
U.S. Treasuries    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 74,136 75,215
Fair Value 74,136 75,215
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 12,075 11,051
Unrealized Losses 12,075 11,051
Obligations of U.S. Government sponsored entities    
Fair Value    
Less than 12 Months 0 0
12 Months or Longer 190,966 192,240
Fair Value 190,966 192,240
Unrealized Losses    
Less than 12 Months 0 0
12 Months or Longer 35,238 33,895
Unrealized Losses $ 35,238 $ 33,895