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INVESTMENT SECURITIES - Held to maturity securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
HELD-TO-MATURITY SECURITIES:    
Amortized Cost $ 189,461 $ 195,088
Fair Value Adjustment (204) (65)
Amortized Carrying Value 189,257 195,023
Gross Unrealized Losses 19,215 23,830
Fair Value 170,042 171,193
Agency mortgage-backed securities    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 71,375 72,495
Fair Value Adjustment 2,005 2,436
Amortized Carrying Value 73,380 74,931
Gross Unrealized Losses 6,351 8,686
Fair Value 67,029 66,245
Agency collateralized mortgage obligations    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 111,936 116,405
Fair Value Adjustment (2,220) (2,502)
Amortized Carrying Value 109,716 113,903
Gross Unrealized Losses 12,327 14,662
Fair Value 97,389 99,241
States and political subdivisions    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 6,150 6,188
Fair Value Adjustment 11 1
Amortized Carrying Value 6,161 6,189
Gross Unrealized Losses 537 482
Fair Value $ 5,624 $ 5,707