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LONG-TERM DEBT - Summary of Long-term Debt (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Apr. 06, 2015
Debt Instrument [Line Items] |  |  |  |
Par Value |  | $ 277,527,000 | $ 260,000,000 |
Unamortized Debt Issuance Cost and Discount |  | $ (3,141,000) | (3,685,000) |
Senior Notes | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) |  | 5.25% |  |
Par Value |  | $ 175,000,000 | 175,000,000 | $ 175,000,000
Unamortized Debt Issuance Cost and Discount |  | $ (1,014,000) | (1,291,000) |
Senior Notes | Subordinated notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) |  | 4.375% |  |
Par Value |  | $ 85,000,000 | 85,000,000 |
Unamortized Debt Issuance Cost and Discount |  | (2,127,000) | (2,394,000) |
Senior Notes | PMB Statutory Trust III, junior subordinated debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Par Value |  | 7,217,000 | 0 |
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 |  | $ 10,310,000 | 0 |
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% |  |
Subordinated Notes | Subordinated notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (percent) | 4.375% |  |  |
Basis spread on variable rate (percent) | 4.195% |  |  |
Par Value | $ 85,000,000 |  |  |

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