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LONG-TERM DEBT - Additional Information (Details) - USD ($)			12 Months Ended
	Oct. 30, 2020	Apr. 06, 2015	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 260,000,000	$ 175,000,000
Senior Notes | 5.25% senior notes due April 15, 2025
Debt Instrument [Line Items]
Aggregate principal amount issued		$ 175,000,000.0	$ 175,000,000	175,000,000
Stated interest rate (percent)			5.25%
Net proceeds from issuance of long-term debt		$ 172,800,000
Debt instrument, optional redemption period prior to maturity			90 days
Minimum redemption period notice required			30 days
Maximum redemption period notice required			60 days
Redemption price, percentage			100.00%
Senior Notes | 4.375% subordinated notes due October 30, 2030
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 85,000,000	$ 0
Subordinated Notes | 4.375% subordinated notes due October 30, 2030
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 85,000,000.0
Stated interest rate (percent)	4.375%
Net proceeds from issuance of long-term debt	$ 82,600,000
Redemption price, percentage	100.00%
Basis spread on variable rate (percent)	4.195%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Contractual interest rate for funds borrowed, under the debt agreement.

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