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Fair Value - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Sep. 30, 2023
Fair Value Disclosures [Abstract] |  |
Other real estate, additions | $ 969 |
Real estate owned outstanding | 845 |
Additions to impaired loans | $ 13,400 |
Impaired loans outstanding |  | $ 13,400

X
- Definition Additions to impaired loans. + References No definition available. + Details
Name: | pb_AdditionsToImpairedLoans
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Impaired loans outstanding. + References No definition available. + Details
Name: | pb_ImpairedLoansOutstanding
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other real estate owned added during the period which is still outstanding. + References No definition available. + Details
Name: | pb_RealEstateOwnedOutstanding
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Additions of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration