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Acquisitions (Acquired Loans) - Additional Information (Details) $ in Millions	Dec. 31, 2024 USD ($)
Non PCD and PCD Loans [Member]
Business Acquisition [Line Items]
Outstanding discount on loans	$ 35.2

X

- Definition

Outstanding discount on loans 1.

+ References

No definition available.

+ Details

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Namespace Prefix:	pb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_FinancialInstrumentAxis=pb_NonPCDAndPCDLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: