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LONG-TERM DEBT - Additional Information (Details) - USD ($)			12 Months Ended
	Oct. 30, 2020	Apr. 06, 2015	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 277,527,000	$ 260,000,000
Senior Notes | Senior notes
Debt Instrument [Line Items]
Aggregate principal amount issued		$ 175,000,000	$ 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 | Subordinated notes
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 85,000,000	$ 85,000,000
Stated interest rate (percent)			4.375%
Subordinated Notes
Debt Instrument [Line Items]
Deferral payment period			5 years
Subordinated Notes | Subordinated notes
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 85,000,000
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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