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Loans and Allowance for Credit Losses - Recorded Investment and Outstanding Balance for Purchased Credit Deteriorated Loans and Non Purchased Credit Deteriorated Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	$ 350,644	$ 440,024
Discount	(5,472)	(7,390)
Recorded investment	345,172	432,634
Non-PCD Loans [Member]
Purchased And Non Purchased Credit Impaired Loans [Line Items]
Outstanding balance	1,609,115	2,089,629
Discount	(20,406)	(27,845)
Recorded investment	$ 1,588,709	$ 2,061,784

X

- Definition

Certain loan acquired in transfer not accounted for as debt securities carrying amount net.

+ References

No definition available.

+ Details

Name:	pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
Namespace Prefix:	pb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Certain loan acquired in transfer not accounted for as debt securities outstanding balance.

+ References

No definition available.

+ Details

Name:	pb_CertainLoanAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
Namespace Prefix:	pb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Discount applied to loans acquired with deteriorated credit quality.

+ References

No definition available.

+ Details

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

X

- Definition

Purchased and non-purchased credit impaired loans.

+ References

No definition available.

+ Details

Name:	pb_PurchasedAndNonPurchasedCreditImpairedLoansLineItems
Namespace Prefix:	pb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredAndNoCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: