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MARKETABLE SECURITIES - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Due within one year	$ 0
Due after one year through five years	11,216
Due after five years through ten years	16,654
Due after ten years	7,651
Available-for-sale debt securities, amortized cost basis	239,945	$ 235,849
Estimated Fair Value
Due within one year	0
Due after one year through five years	10,852
Due after five years through ten years	16,287
Due after ten years	7,408
Available-for-sale debt securities, estimated fair value	232,975	232,372
Amortized Cost
Due within one year	764
Due after one year through five years	19,062
Due after five years through ten years	43,059
Due after ten years	79,057
Amortized Cost	163,164	174,684
Estimated Fair Value
Due within one year	764
Due after one year through five years	19,286
Due after five years through ten years	43,795
Due after ten years	78,159
Held-to-maturity securities, estimated fair value	162,800	176,790
Mortgage-backed securities
Amortized Cost
Available-for-sale securities without single maturity date	93,083
Available-for-sale debt securities, amortized cost basis	93,083	92,471
Estimated Fair Value
Available-for-sale securities without single maturity date	89,459
Available-for-sale debt securities, estimated fair value	89,459	90,678
Amortized Cost
Held-to-maturity securities, without single maturity date	17,163
Amortized Cost	17,163	22,026
Estimated Fair Value
Held-to-maturity securities, without single maturity date	16,717
Held-to-maturity securities, estimated fair value	16,717	21,995
Collateralized mortgage obligations
Amortized Cost
Available-for-sale securities without single maturity date	111,341
Available-for-sale debt securities, amortized cost basis	111,341	116,809
Estimated Fair Value
Available-for-sale securities without single maturity date	108,969
Available-for-sale debt securities, estimated fair value	108,969	115,311
Amortized Cost
Held-to-maturity securities, without single maturity date	4,059
Amortized Cost	4,059	6,162
Estimated Fair Value
Held-to-maturity securities, without single maturity date	4,079
Held-to-maturity securities, estimated fair value	$ 4,079	$ 6,273

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