LOANS - (Schedule of Loans Modifications as Subsequent Default, By Payment Status (Details) - Not Past Due [Member] $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($)
Loans modified	$ 3,254
Consumer Loan [Member] \| Commercial and Industrial [Member]
Loans modified	$ 3,254

Financing receivable excluding accrued interest modified in period amount.

No definition available.

Name:	pgc_FinancingReceivableExcludingAccruedInterestModifiedInPeriodAmount
Namespace Prefix:	pgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration