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INVESTMENT SECURITIES - Held to maturity securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
HELD-TO-MATURITY SECURITIES:    
Amortized Cost $ 181,767 $ 187,695
Fair Value Adjustment (452) (262)
Amortized Carrying Value 181,315 187,433
Gross Unrealized Losses 17,726 24,668
Fair Value 163,589 162,765
Agency mortgage-backed securities    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 70,036 71,065
Fair Value Adjustment 1,450 1,864
Amortized Carrying Value 71,486 72,929
Gross Unrealized Losses 6,086 8,523
Fair Value 65,400 64,406
Agency collateralized mortgage obligations    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 105,632 110,493
Fair Value Adjustment (1,926) (2,140)
Amortized Carrying Value 103,706 108,353
Gross Unrealized Losses 11,080 15,495
Fair Value 92,626 92,858
States and political subdivisions    
HELD-TO-MATURITY SECURITIES:    
Amortized Cost 6,099 6,137
Fair Value Adjustment 24 14
Amortized Carrying Value 6,123 6,151
Gross Unrealized Losses 560 650
Fair Value $ 5,563 $ 5,501