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INVESTMENT SECURITIES - Held-to-Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 92,336 $ 96,379
Gross Unrealized Gains 3 7
Gross Unrealized Losses 23,587 19,607
Estimated Fair Value 68,752 76,779
Obligations of states and political subdivisions    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 600 600
Gross Unrealized Gains 0 0
Gross Unrealized Losses 48 54
Estimated Fair Value 552 546
Mortgage-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 91,736 95,779
Gross Unrealized Gains 3 7
Gross Unrealized Losses 23,539 19,553
Estimated Fair Value $ 68,200 $ 76,233