MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due within one year	$ 7,497
Due after one year through five years	2,039
Due after five years through ten years	22,646
Due after ten years	0
Available-for-sale debt securities, amortized cost basis	249,938	$ 215,380
Estimated Fair Value
Due within one year	7,373
Due after one year through five years	1,851
Due after five years through ten years	20,309
Due after ten years	0
Available-for-sale debt securities, estimated fair value	228,787	196,195
Held to Maturity Amortized Cost
Due within one year	23,695
Due after one year through five years	61,338
Due after five years through ten years	86,992
Due after ten years	37,894
Held to Maturity debt securities, amortized cost	363,963	404,208
Held to Maturity Estimated Fair Value
Due within one year	23,456
Due after one year through five years	58,931
Due after five years through ten years	84,340
Due after ten years	35,361
Held to maturity debt securities, estimated fair value	331,480	374,523
Mortgage-backed securities
Amortized Cost
Available-for-sale debt securities, amortized cost basis	199,776
Available-for-sale debt securities, amortized cost basis	199,776	164,419
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	183,140
Available-for-sale debt securities, estimated fair value	183,140	149,812
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	117,454
Held to Maturity debt securities, amortized cost	117,454	119,872
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	100,579
Held to maturity debt securities, estimated fair value	100,579	104,767
Collateralized mortgage obligations
Amortized Cost
Available-for-sale debt securities, amortized cost basis	17,980
Available-for-sale debt securities, amortized cost basis	17,980	18,757
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	16,114
Available-for-sale debt securities, estimated fair value	16,114	17,074
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	36,590
Held to Maturity debt securities, amortized cost	36,590	37,437
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	28,813
Held to maturity debt securities, estimated fair value	$ 28,813	$ 30,161