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DEPOSITS (Details of Total Deposits) (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Deposits: |  |
Interest-bearing checking, reciprocal balances | $ 2,180.0 | $ 1,980.0
Money market, reciprocal balances | $ 81.8 | $ 165.6

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- Definition Deposits + References No definition available. + Details
Name: | pgc_DepositsDetailsAbstract
Namespace Prefix: | pgc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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