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DEPOSITS (Details of Total Deposits) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Deposits:
Interest-bearing checking, reciprocal balances	$ 1,660.0	$ 1,570.0
Money market, reciprocal balances	$ 106.6	$ 85.3

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

X

- Definition

Money market deposit, reciprocal program

+ References

No definition available.

+ Details

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