MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Due within one year	$ 10,462
Due after one year through five years	12,032
Due after five years through ten years	22,616
Due after ten years	0
Available-for-sale debt securities, amortized cost basis	288,167	$ 215,380
Estimated Fair Value
Due within one year	10,426
Due after one year through five years	11,951
Due after five years through ten years	21,031
Due after ten years	0
Available-for-sale debt securities, estimated fair value	277,567	196,195
Held to Maturity Amortized Cost
Due within one year	34,512
Due after one year through five years	41,115
Due after five years through ten years	89,580
Due after ten years	30,477
Held to Maturity debt securities, amortized cost	341,911	404,208
Held to Maturity Estimated Fair Value
Due within one year	34,241
Due after one year through five years	39,991
Due after five years through ten years	87,178
Due after ten years	28,315
Held to maturity debt securities, estimated fair value	319,313	374,523
Mortgage-backed securities
Amortized Cost
Available-for-sale debt securities, amortized cost basis	227,136
Available-for-sale debt securities, amortized cost basis	227,136	164,419
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	219,434
Available-for-sale debt securities, estimated fair value	219,434	149,812
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	111,767
Held to Maturity debt securities, amortized cost	111,767	119,872
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	100,822
Held to maturity debt securities, estimated fair value	100,822	104,767
Collateralized mortgage obligations
Amortized Cost
Available-for-sale debt securities, amortized cost basis	15,921
Available-for-sale debt securities, amortized cost basis	15,921	18,757
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	14,725
Available-for-sale debt securities, estimated fair value	14,725	17,074
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	34,460
Held to Maturity debt securities, amortized cost	34,460	37,437
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	28,766
Held to maturity debt securities, estimated fair value	$ 28,766	$ 30,161