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INVESTMENT SECURITIES - Held to maturity securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
HELD-TO-MATURITY SECURITIES:    
Amortized cost $ 200,332 $ 202,377
Fair Value Adjustment 95 118
Amortized Carrying Value 200,427 202,495
Gross Unrealized Losses 20,574 24,730
Fair Value 179,853 177,765
Agency mortgage-backed securities    
HELD-TO-MATURITY SECURITIES:    
Amortized cost 73,612 73,891
Fair Value Adjustment 2,870 3,015
Amortized Carrying Value 76,482 76,906
Gross Unrealized Losses 8,247 9,820
Fair Value 68,235 67,086
Agency collateralized mortgage obligations    
HELD-TO-MATURITY SECURITIES:    
Amortized cost 120,494 122,247
Fair Value Adjustment (2,767) (2,885)
Amortized Carrying Value 117,727 119,362
Gross Unrealized Losses 11,735 14,129
Fair Value 105,992 105,233
States and political subdivisions    
HELD-TO-MATURITY SECURITIES:    
Amortized cost 6,226 6,239
Fair Value Adjustment (8) (12)
Amortized Carrying Value 6,218 6,227
Gross Unrealized Losses 592 781
Fair Value $ 5,626 $ 5,446