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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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