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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value $ 30,133 $ 355,027
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (928) (38,996)
Available-for-sale securities, 12 Months or More, Fair Value 437,382 116,980
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (61,525) (23,745)
Available-for-sale securities, Fair Value 467,515 472,007
Available-for-sale securities, Unrealized Loss (62,453) (62,741)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 173,661 56,592
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (24,726)  
Held-to-maturity securities, Fair Value 173,661  
Held-to-maturity securities, Unrealized Losses (24,726)  
Held-to-maturity securities, Less than 12 Month, Fair Value   121,173
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (14,278)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses   (10,452)
Held-to-maturity securities, Fair Value   177,765
Held-to-maturity securities, Unrealized Losses   (24,730)
Agency mortgage-backed securities.    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 2,972 221,562
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (245) (27,597)
Available-for-sale securities, 12 Months or More, Fair Value 275,522 64,918
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (40,498) (13,187)
Available-for-sale securities, Fair Value 278,494 286,480
Available-for-sale securities, Unrealized Loss (40,743) (40,784)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 65,887 7,868
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (10,034)  
Held-to-maturity securities, Fair Value 65,887  
Held-to-maturity securities, Unrealized Losses (10,034)  
Held-to-maturity securities, Less than 12 Month, Fair Value   59,218
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (7,766)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses   (2,054)
Held-to-maturity securities, Fair Value   67,086
Held-to-maturity securities, Unrealized Losses   (9,820)
Agency collateralized mortgage obligations    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 8,908 28,537
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (390) (3,262)
Available-for-sale securities, 12 Months or More, Fair Value 67,592 40,642
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (10,887) (8,469)
Available-for-sale securities, Fair Value 76,500 69,179
Available-for-sale securities, Unrealized Loss (11,277) (11,731)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 102,245 44,178
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (14,013)  
Held-to-maturity securities, Fair Value 102,245  
Held-to-maturity securities, Unrealized Losses (14,013)  
Held-to-maturity securities, Less than 12 Month, Fair Value   61,055
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (6,411)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses   (7,718)
Held-to-maturity securities, Fair Value   105,233
Held-to-maturity securities, Unrealized Losses   (14,129)
States and political subdivisions securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 10,348 60,473
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (106) (5,224)
Available-for-sale securities, 12 Months or More, Fair Value 36,979 7,667
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (2,781) (1,711)
Available-for-sale securities, Fair Value 47,327 68,140
Available-for-sale securities, Unrealized Loss (2,887) (6,935)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 5,529 4,546
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (679)  
Held-to-maturity securities, Fair Value 5,529  
Held-to-maturity securities, Unrealized Losses (679)  
Held-to-maturity securities, Less than 12 Month, Fair Value   900
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (101)
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses   (680)
Held-to-maturity securities, Fair Value   5,446
Held-to-maturity securities, Unrealized Losses   (781)
Small Business Administration securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 7,905 44,455
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (187) (2,913)
Available-for-sale securities, 12 Months or More, Fair Value 57,289 3,753
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (7,359) (378)
Available-for-sale securities, Fair Value 65,194 48,208
Available-for-sale securities, Unrealized Loss $ (7,546) $ (3,291)