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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, 2024 | Dec. 31, 2023
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PCD Loans [Member] |  |
Purchased And Non Purchased Credit Impaired Loans [Line Items] |  |
Outstanding balance | $ 468,657 | $ 533,653
Discount | (8,274) | (7,914)
Recorded investment | 460,383 | 525,739
Non-PCD Loans [Member] |  |
Purchased And Non Purchased Credit Impaired Loans [Line Items] |  |
Outstanding balance | 2,314,275 | 1,823,809
Discount | (30,612) | (19,992)
Recorded investment | $ 2,283,663 | $ 1,803,817

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: |