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DEPOSITS (Details of Total Deposits) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Deposits:
Reciprocal balances	$ 658.0	$ 423.8

X

- Definition

Deposits

+ References

No definition available.

+ Details

Name:	pgc_DepositsDetailsAbstract
Namespace Prefix:	pgc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Interest Bearing Deposit, Reciprocal Program.

+ References

No definition available.

+ Details

Name:	pgc_InterestBearingForeignDepositReciprocalProgram
Namespace Prefix:	pgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant