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LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Par Value	$ 276,527	$ 277,527
Unamortized Debt Issuance Cost and Discount	$ (2,406)	(2,621)
Senior Notes | Senior notes
Debt Instrument [Line Items]
Stated interest rate	5.25%
Par Value	$ 174,000	175,000
Unamortized Debt Issuance Cost and Discount	$ (609)	(722)
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	$ (1,797)	(1,899)
Senior Notes | Subordinated notes | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	4.195%
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 | SOFR
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 | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	2.00%

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