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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Par Value | $ 277,527 | $ 277,527
Unamortized Debt Issuance Cost and Discount | $ (2,781) | (3,141)
Senior Notes | Senior notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.25% |
Par Value | $ 175,000 | 175,000
Unamortized Debt Issuance Cost and Discount | $ (816) | (1,014)
Senior Notes | Subordinated notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.375% |
Par Value | $ 85,000 | 85,000
Unamortized Debt Issuance Cost and Discount | (1,965) | (2,127)
Senior Notes | PMB Statutory Trust III, junior subordinated debentures |  |
Debt Instrument [Line Items] |  |
Par Value | 7,217 | 7,217
Unamortized Debt Issuance Cost and Discount | $ 0 | 0
Senior Notes | PMB Statutory Trust III, junior subordinated debentures | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (percent) | 3.40% |
Senior Notes | PMB Capital Trust III, junior subordinated debentures |  |
Debt Instrument [Line Items] |  |
Par Value | $ 10,310 | 10,310
Unamortized Debt Issuance Cost and Discount | $ 0 | $ 0
Senior Notes | PMB Capital Trust III, junior subordinated debentures | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (percent) | 2.00% |

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