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MARKETABLE SECURITIES - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Due within one year	$ 2,005
Due after one year through five years	7,544
Due after five years through ten years	22,675
Due after ten years	0
Available-for-sale debt securities, amortized cost basis	203,373	$ 208,165
Estimated Fair Value
Due within one year	1,967
Due after one year through five years	7,145
Due after five years through ten years	19,801
Due after ten years	0
Available-for-sale debt securities, estimated fair value	178,644	188,927
Held to Maturity Amortized Cost
Due within one year	46,996
Due after one year through five years	68,569
Due after five years through ten years	80,411
Due after ten years	51,577
Held to Maturity debt securities, amortized cost	408,308	509,008
Held to Maturity Estimated Fair Value
Due within one year	46,316
Due after one year through five years	65,029
Due after five years through ten years	76,728
Due after ten years	46,934
Held to maturity debt securities, estimated fair value	367,691	475,068
Mortgage-backed securities
Amortized Cost
Available-for-sale debt securities, amortized cost basis	151,424
Available-for-sale debt securities, amortized cost basis	151,424	145,896
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	132,141
Available-for-sale debt securities, estimated fair value	132,141	130,341
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	122,231
Held to Maturity debt securities, amortized cost	122,231	132,693
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	102,600
Held to maturity debt securities, estimated fair value	102,600	117,985
Collateralized mortgage obligations
Amortized Cost
Available-for-sale debt securities, amortized cost basis	19,725
Available-for-sale debt securities, amortized cost basis	19,725	21,981
Estimated Fair Value
Available-for-sale debt securities, estimated fair value	17,590
Available-for-sale debt securities, estimated fair value	17,590	20,157
Held to Maturity Amortized Cost
Held to Maturity debt securities, amortized cost	38,524
Held to Maturity debt securities, amortized cost	38,524	41,759
Held to Maturity Estimated Fair Value
Held to maturity debt securities, estimated fair value	30,084
Held to maturity debt securities, estimated fair value	$ 30,084	$ 34,334

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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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