MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 2,003
Due after one year through five years	7,540
Due after five years through ten years	22,661
Due after ten years	0
Available-for-sale debt securities, amortized cost basis	215,380	$ 208,165
Estimated Fair Value
Due within one year	1,979
Due after one year through five years	7,229
Due after five years through ten years	20,101
Due after ten years	0
Available-for-sale debt securities, estimated fair value	196,195	188,927
Held to Maturity Amortized Cost
Due within one year	47,009
Due after one year through five years	68,564
Due after five years through ten years	79,950
Due after ten years	51,376
Held to Maturity debt securities, amortized cost	404,208	509,008
Held to Maturity Estimated Fair Value
Due within one year	46,674
Due after one year through five years	66,189
Due after five years through ten years	77,878
Due after ten years	48,854
Held to maturity debt securities, estimated fair value	374,523	475,068
Mortgage-backed securities
Amortized Cost
Available-for-sale debt securities, amortized cost basis	164,419
Available-for-sale debt securities, amortized cost basis	164,419	145,896
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	149,812
Available-for-sale debt securities, estimated fair value	149,812	130,341
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	119,872
Held to Maturity debt securities, amortized cost	119,872	132,693
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	104,767
Held to maturity debt securities, estimated fair value	104,767	117,985
Collateralized mortgage obligations
Amortized Cost
Available-for-sale debt securities, amortized cost basis	18,757
Available-for-sale debt securities, amortized cost basis	18,757	21,981
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	17,074
Available-for-sale debt securities, estimated fair value	17,074	20,157
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	37,437
Held to Maturity debt securities, amortized cost	37,437	41,759
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	30,161
Held to maturity debt securities, estimated fair value	$ 30,161	$ 34,334