MARKETABLE SECURITIES - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Due within one year	$ 5,019
Due after one year through five years	10,100
Due after five years through ten years	26,285
Due after ten years	3,086
Available-for-sale debt securities, amortized cost basis	218,490	$ 341,628
Estimated Fair Value
Due within one year	4,967
Due after one year through five years	9,743
Due after five years through ten years	24,833
Due after ten years	2,984
Available-for-sale debt securities, estimated fair value	197,944	342,206
Held to Maturity Amortized Cost
Due within one year	208,372
Due after one year through five years	107,637
Due after five years through ten years	67,053
Due after ten years	71,875
Held to Maturity debt securities, amortized cost	633,386	184,263
Held to Maturity Estimated Fair Value
Due within one year	206,824
Due after one year through five years	105,615
Due after five years through ten years	62,297
Due after ten years	65,439
Held to maturity debt securities, estimated fair value	595,844	192,472
Mortgage-backed securities
Amortized Cost
Available-for-sale debt securities, amortized cost basis	150,516
Available-for-sale debt securities, amortized cost basis	150,516	221,610
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	133,615
Available-for-sale debt securities, estimated fair value	133,615	221,308
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	135,292
Held to Maturity debt securities, amortized cost	135,292	2,953
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	119,549
Held to maturity debt securities, estimated fair value	119,549	2,916
Collateralized mortgage obligations
Amortized Cost
Available-for-sale debt securities, amortized cost basis	23,484
Available-for-sale debt securities, amortized cost basis	23,484	74,925
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	21,802
Available-for-sale debt securities, estimated fair value	21,802	$ 74,992
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	43,157
Held to Maturity debt securities, amortized cost	43,157
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	36,120
Held to maturity debt securities, estimated fair value	$ 36,120