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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value $ 5,133 $ 21,180
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (45) (358)
Available-for-sale securities, 12 Months or More, Fair Value 427,737 435,747
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (42,544) (53,861)
Available-for-sale securities, Fair Value 432,870 456,927
Available-for-sale securities, Unrealized Loss (42,589) (54,219)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 170,042 171,193
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (19,215) (23,830)
Held-to-maturity securities, Fair Value 170,042 171,193
Held-to-maturity securities, Unrealized Losses (19,215) (23,830)
Agency mortgage-backed securities.    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 3,784 4,318
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (34) (9)
Available-for-sale securities, 12 Months or More, Fair Value 269,222 274,801
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (28,026) (35,881)
Available-for-sale securities, Fair Value 273,006 279,119
Available-for-sale securities, Unrealized Loss (28,060) (35,890)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 67,030 66,245
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (6,351) (8,686)
Held-to-maturity securities, Fair Value 67,030 66,245
Held-to-maturity securities, Unrealized Losses (6,351) (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 66,735 66,866
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (7,385) (9,827)
Available-for-sale securities, Fair Value 66,735 75,946
Available-for-sale securities, Unrealized Loss (7,385) (10,043)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 97,389 99,241
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (12,327) (14,662)
Held-to-maturity securities, Fair Value 97,389 99,241
Held-to-maturity securities, Unrealized Losses (12,327) (14,662)
States and political subdivisions securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 1,349 7,782
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (11) (133)
Available-for-sale securities, 12 Months or More, Fair Value 37,640 56,111
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (1,464) (6,622)
Available-for-sale securities, Fair Value 38,989 63,893
Available-for-sale securities, Unrealized Loss (1,475) (6,755)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 5,623 5,707
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (537) (482)
Held-to-maturity securities, Fair Value 5,623 5,707
Held-to-maturity securities, Unrealized Losses (537) (482)
Small Business Administration securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, 12 Months or More, Fair Value 54,140 37,969
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (5,669) (1,531)
Available-for-sale securities, Fair Value 54,140 37,969
Available-for-sale securities, Unrealized Loss $ (5,669) $ (1,531)