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INVESTMENT SECURITIES - Fair value and unrealized losses on investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value $ 30,101 $ 355,027
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (2,914) (38,996)
Available-for-sale securities, 12 Months or More, Fair Value 416,601 116,980
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (81,368) (23,745)
Available-for-sale securities, Fair Value 446,702 472,007
Available-for-sale securities, Unrealized Loss (84,282) (62,741)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 166,090 56,592
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (30,626) (10,452)
Held-to-maturity securities, Fair Value 166,090 177,765
Held-to-maturity securities, Unrealized Losses (30,626) (24,730)
Held-to-maturity securities, Less than 12 Month, Fair Value   121,173
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (14,278)
Agency mortgage-backed securities.    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 1 221,562
Available-for-sale Securities, Less than 12 Months, Unrealized Loss   (27,597)
Available-for-sale securities, 12 Months or More, Fair Value 260,488 64,918
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (54,143) (13,187)
Available-for-sale securities, Fair Value 260,489 286,480
Available-for-sale securities, Unrealized Loss (54,143) (40,784)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 63,168 7,868
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (12,340) (2,054)
Held-to-maturity securities, Fair Value 63,168 67,086
Held-to-maturity securities, Unrealized Losses (12,340) (9,820)
Held-to-maturity securities, Less than 12 Month, Fair Value   59,218
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (7,766)
Agency collateralized mortgage obligations    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 8,236 28,537
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (1,061) (3,262)
Available-for-sale securities, 12 Months or More, Fair Value 64,898 40,642
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (12,492) (8,469)
Available-for-sale securities, Fair Value 73,134 69,179
Available-for-sale securities, Unrealized Loss (13,553) (11,731)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 97,815 44,178
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (17,195) (7,718)
Held-to-maturity securities, Fair Value 97,815 105,233
Held-to-maturity securities, Unrealized Losses (17,195) (14,129)
Held-to-maturity securities, Less than 12 Month, Fair Value   61,055
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (6,411)
States and political subdivisions securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 14,242 60,473
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (1,387) (5,224)
Available-for-sale securities, 12 Months or More, Fair Value 36,902 7,667
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (5,506) (1,711)
Available-for-sale securities, Fair Value 51,144 68,140
Available-for-sale securities, Unrealized Loss (6,893) (6,935)
HELD-TO-MATURITY SECURITIES:    
Held-to-maturity securities, 12 Months or Longer, Fair Value 5,107 4,546
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses (1,091) (680)
Held-to-maturity securities, Fair Value 5,107 5,446
Held-to-maturity securities, Unrealized Losses (1,091) (781)
Held-to-maturity securities, Less than 12 Month, Fair Value   900
Held-to-maturity securities, Less than 12 Months, Unrealized Losses   (101)
Small Business Administration securities    
AVAILABLE-FOR-SALE SECURITIES:    
Available-for-sale securities, Less than 12 Months, Fair Value 7,622 44,455
Available-for-sale Securities, Less than 12 Months, Unrealized Loss (466) (2,913)
Available-for-sale securities, 12 Months or More, Fair Value 54,313 3,753
Available-for-sale Securities,12 Months or Longer, Unrealized Loss (9,227) (378)
Available-for-sale securities, Fair Value 61,935 48,208
Available-for-sale securities, Unrealized Loss $ (9,693) $ (3,291)