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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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