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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value $ 18,569 $ 21,180
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (189) (358)
Available-for-sale securities, 12 Months or More, Fair Value 440,260 435,747
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (60,920) (53,861)
Available-for-sale securities, Fair Value 458,829 456,927
Available-for-sale securities, Unrealized Loss (61,109) (54,219)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 167,756 171,193
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (25,610) (23,830)
Held-to-maturity securities, Fair Value 167,756 171,193
Held-to-maturity securities, Unrealized Losses (25,610) (23,830)
Agency mortgage-backed securities.    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 5,369 4,318
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (46) (9)
Available-for-sale securities, 12 Months or More, Fair Value 265,883 274,801
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (40,770) (35,881)
Available-for-sale securities, Fair Value 271,252 279,119
Available-for-sale securities, Unrealized Loss (40,816) (35,890)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 65,277 66,245
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (9,210) (8,686)
Held-to-maturity securities, Fair Value 65,277 66,245
Held-to-maturity securities, Unrealized Losses (9,210) (8,686)
Agency collateralized mortgage obligations    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value   9,080
Available-for-sale Securities, Less than 12 Months, Unrealized Loss   (216)
Available-for-sale securities, 12 Months or More, Fair Value 75,307 66,866
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (10,242) (9,827)
Available-for-sale securities, Fair Value 75,307 75,946
Available-for-sale securities, Unrealized Loss (10,242) (10,043)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 96,881 99,241
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (15,819) (14,662)
Held-to-maturity securities, Fair Value 96,881 99,241
Held-to-maturity securities, Unrealized Losses (15,819) (14,662)
Small Business Administration securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value   7,782
Available-for-sale Securities, Less than 12 Months, Unrealized Loss   (133)
Available-for-sale securities, 12 Months or More, Fair Value 61,766 56,111
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (7,843) (6,622)
Available-for-sale securities, Fair Value 61,766 63,893
Available-for-sale securities, Unrealized Loss (7,843) (6,755)
States and political subdivisions securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 13,200  
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (143)  
Available-for-sale securities, 12 Months or More, Fair Value 37,304 37,969
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (2,065) (1,531)
Available-for-sale securities, Fair Value 50,504 37,969
Available-for-sale securities, Unrealized Loss (2,208) (1,531)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 5,598 5,707
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (581) (482)
Held-to-maturity securities, Fair Value 5,598 5,707
Held-to-maturity securities, Unrealized Losses $ (581) $ (482)