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SECURITIES (Securities held to maturity) (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 164,348 $ 697,424
Unrealized Losses, Less than 12 months $ (14,240) $ (55,942)
Count, Less than 12 months | security 38 155
Fair Value, 12 months or longer $ 531,005 $ 0
Unrealized Losses, 12 months or longer $ (63,909) $ 0
Count, 12 months or longer | security 129 0
Fair Value, Total $ 695,353 $ 697,424
Unrealized Losses, Total $ (78,149) $ (55,942)
Count, Total | security 167 155
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Fair Value, Less than 12 months $ 164,348 $ 697,424
Unrealized Losses, Less than 12 months $ (14,240) $ (55,942)
Count, Less than 12 months | security 38 155
Fair Value, 12 months or longer $ 531,005 $ 0
Unrealized Losses, 12 months or longer $ (63,909) $ 0
Count, 12 months or longer | security 129 0
Fair Value, Total $ 695,353 $ 697,424
Unrealized Losses, Total $ (78,149) $ (55,942)
Count, Total | security 167 155