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INVESTMENT SECURITIES - Held to maturity securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
HELD-TO-MATURITY SECURITIES:    
Amortized Cost $ 196,720 $ 202,377
Fair Value Adjustment (4) 118
Amortized Carrying Value 196,716 202,495
Gross Unrealized Losses 30,626 24,730
Fair Value 166,090 177,765
Agency mortgage-backed securities    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 72,927 73,891
Fair Value Adjustment 2,581 3,015
Amortized Carrying Value 75,508 76,906
Gross Unrealized Losses 12,340 9,820
Fair Value 63,168 67,086
Agency collateralized mortgage obligations    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 117,593 122,247
Fair Value Adjustment (2,583) (2,885)
Amortized Carrying Value 115,010 119,362
Gross Unrealized Losses 17,195 14,129
Fair Value 97,815 105,233
States and political subdivisions    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 6,200 6,239
Fair Value Adjustment (2) (12)
Amortized Carrying Value 6,198 6,227
Gross Unrealized Losses 1,091 781
Fair Value $ 5,107 $ 5,446