MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2020

Investments Debt And Equity Securities [Abstract]

Schedule of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity Securities

The following tables summarize the amortized cost and fair value of securities available for sale as of December 31, 2020, and the amortized cost and fair value of securities held to maturity and available for sale, respectively, as of December 31, 2019 and the corresponding amounts of gross unrealized gains and losses:

December 31, 2020	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available for sale:
Corporate bonds	$	29,608	$	1,382	$	8	$	30,982
Municipal securities		164,668		11,036		—		175,704
Mortgage-backed securities		104,210		3,041		87		107,164
Collateralized mortgage obligations		64,611		2,335		1		66,945
Total available for sale	$	363,097	$	17,794	$	96	$	380,795

December 31, 2019	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available for sale:
Corporate bonds	$	19,667	$	592	$	—	$	20,259
Municipal securities		16,780		576		8		17,348
Mortgage-backed securities		83,967		550		335		84,182
Collateralized mortgage obligations		89,798		1,146		17		90,927
Total available for sale	$	210,212	$	2,864	$	360	$	212,716
Held to maturity:
Municipal securities	$	138,416	$	4,710	$	3	$	143,123
Mortgage-backed securities		14,365		198		13		14,550
Collateralized mortgage obligations		2,677		110		—		2,787
Total held to maturity	$	155,458	$	5,018	$	16	$	160,460

Schedule of Securities with Gross Unrealized Losses

Information pertaining to securities with gross unrealized losses as of December 31, 2020, for which no allowance for credit losses has been recorded, and December 31, 2019, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position is detailed in the following tables:

	Less Than 12 Months					12 Months or Longer					Total
December 31, 2020	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Available for sale:
Corporate bonds	$	(8	)	$	2,493	$	—		$	—	$	(8	)	$	2,493
Mortgage-backed securities		(87	)		25,775		—			—		(87	)		25,775
Collateralized mortgage obligations		—			—		(1	)		106		(1	)		106
Total available for sale	$	(95	)	$	28,268	$	(1	)	$	106	$	(96	)	$	28,374

	Less Than 12 Months					12 Months or Longer					Total
December 31, 2019	Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value
Available for sale:
Municipal securities	$	(8	)	$	1,138	$	—		$	—	$	(8	)	$	1,138
Mortgage-backed securities		(25	)		19,421		(310	)		42,116		(335	)		61,537
Collateralized mortgage obligations		—			—		(17	)		2,594		(17	)		2,594
Total available for sale	$	(33	)	$	20,559	$	(327	)	$	44,710	$	(360	)	$	65,269
Held to maturity:
Municipal securities	$	(1	)	$	1,313	$	(2	)	$	759	$	(3	)	$	2,072
Mortgage-backed securities		—			—		(13	)		7,032		(13	)		7,032
Total held to maturity	$	(1	)	$	1,313	$	(15	)	$	7,791	$	(16	)	$	9,104

Schedule of Proceeds from Sales of Available for Sale Securities

The proceeds from sales of available for sale securities and the associated gains and losses are listed below:

	2020		2019			2018
Proceeds from sales	$	—	$	3,957		$	411,796
Gross gains		—		—			4
Gross losses		—		(22	)		(54	)

Investments Classified by Contractual Maturity Date

The contractual maturities at December 31, 2020 of available for sale securities at carrying value and estimated fair value are shown below. The Company invests in mortgage-backed securities and collateralized mortgage obligations that have expected maturities that differ from their contractual maturities. These differences arise because borrowers and/or issuers may have the right to call or prepay their obligation with or without call or prepayment penalties.

	Available for Sale
December 31, 2020	Amortized Cost		Estimated Fair Value
Due within one year	$	4,139	$	4,154
Due after one year through five years		52,050		54,688
Due after five years through ten years		60,132		63,966
Due after ten years		77,955		83,878
Mortgage-backed securities		104,210		107,164
Collateralized mortgage obligations		64,611		66,945
Total Securities	$	363,097	$	380,795