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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
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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: |