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Goodwill and Core Deposit Intangibles - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($)
Schedule Of Intangible Assets And Goodwill [Line Items] |
Impairment recorded on goodwill and core deposit intangibles | $ 0
Minimum [Member] |
Schedule Of Intangible Assets And Goodwill [Line Items] |
Finite-lived intangible assets, useful life | 10 years
Maximum [Member] |
Schedule Of Intangible Assets And Goodwill [Line Items] |
Finite-lived intangible assets, useful life | 15 years

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- Definition Schedule of intangible assets and goodwill. + References No definition available. + Details
Name: | pb_ScheduleOfIntangibleAssetsAndGoodwillLineItems
Namespace Prefix: | pb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
Name: | us-gaap_GoodwillAndIntangibleAssetImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |