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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Par Value	$ 277,527	$ 277,527
Unamortized Debt Issuance Cost and Discount	$ (2,940)	(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	$ (910)	(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	(2,030)	(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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