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Fair Value - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025
Fair Value Disclosures [Abstract]
Other real estate, additions	$ 8.0	$ 14.9
Real estate owned outstanding	7.6	12.4
Additions to impaired loans	19.4	76.0
Impaired loans outstanding	$ 19.4	$ 64.4

X

- Definition

Additions to impaired loans.

+ References

No definition available.

+ Details

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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
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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