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INVESTMENT SECURITIES - Held to maturity securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
HELD-TO-MATURITY SECURITIES:    
Amortized Cost $ 178,164 $ 179,717
Fair Value Adjustment (570) (517)
Amortized Carrying Value 177,594 179,200
Gross Unrealized Losses 17,074 16,571
Fair Value 160,520 162,629
Agency mortgage-backed securities    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 69,377 69,713
Fair Value Adjustment 1,179 1,313
Amortized Carrying Value 70,556 71,026
Gross Unrealized Losses 5,820 5,694
Fair Value 64,736 65,332
Agency collateralized mortgage obligations    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 102,711 103,918
Fair Value Adjustment (1,778) (1,857)
Amortized Carrying Value 100,933 102,061
Gross Unrealized Losses 10,739 10,424
Fair Value 90,194 91,637
States and political subdivisions securities    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 6,076 6,086
Fair Value Adjustment 29 27
Amortized Carrying Value 6,105 6,113
Gross Unrealized Losses 515 453
Fair Value $ 5,590 $ 5,660