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Securities (Details 3) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investment securities with unrealized losses    
Fair Value, Less Than 12 Months $ 78,612 $ 49,846
Unrealized Losses, Less Than 12 Months (2,921) (3,025)
Fair Value, 12 Months or Longer 1,071,733 1,116,642
Unrealized Losses, 12 Months or Longer (235,089) (219,539)
Fair Value, Total 1,150,345 1,166,488
Unrealized Losses, Total (238,010) (222,564)
U.S. Treasury and U.S. government sponsored entities    
Investment securities with unrealized losses    
Fair Value, Less Than 12 Months 449 399
Unrealized Losses, Less Than 12 Months (1) (1)
Fair Value, 12 Months or Longer 116,810 122,361
Unrealized Losses, 12 Months or Longer (18,584) (17,596)
Fair Value, Total 117,259 122,760
Unrealized Losses, Total (18,585) (17,597)
State and political subdivisions    
Investment securities with unrealized losses    
Fair Value, Less Than 12 Months 28,380 15,852
Unrealized Losses, Less Than 12 Months (1,414) (1,684)
Fair Value, 12 Months or Longer 412,504 428,416
Unrealized Losses, 12 Months or Longer (96,730) (91,819)
Fair Value, Total 440,884 444,268
Unrealized Losses, Total (98,144) (93,503)
Corporate bonds    
Investment securities with unrealized losses    
Fair Value, Less Than 12 Months 8,059 8,463
Unrealized Losses, Less Than 12 Months (275) (284)
Fair Value, 12 Months or Longer 4,869 3,881
Unrealized Losses, 12 Months or Longer (182) (182)
Fair Value, Total 12,928 12,344
Unrealized Losses, Total (457) (466)
Mortgage-backed securities - residential    
Investment securities with unrealized losses    
Fair Value, Less Than 12 Months 4,272 5,113
Unrealized Losses, Less Than 12 Months (90) (76)
Fair Value, 12 Months or Longer 495,129 515,259
Unrealized Losses, 12 Months or Longer (113,538) (104,068)
Fair Value, Total 499,401 520,372
Unrealized Losses, Total (113,628) (104,144)
Collateralized mortgage obligations    
Investment securities with unrealized losses    
Fair Value, Less Than 12 Months 37,452 20,019
Unrealized Losses, Less Than 12 Months (1,141) (980)
Fair Value, 12 Months or Longer 39,674 43,808
Unrealized Losses, 12 Months or Longer (5,739) (5,579)
Fair Value, Total 77,126 63,827
Unrealized Losses, Total (6,880) (6,559)
Small Business Administration    
Investment securities with unrealized losses    
Fair Value, Less Than 12 Months 0 0
Unrealized Losses, Less Than 12 Months 0 0
Fair Value, 12 Months or Longer 2,747 2,917
Unrealized Losses, 12 Months or Longer (316) (295)
Fair Value, Total 2,747 2,917
Unrealized Losses, Total $ (316) $ (295)