XML 47 R40.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Loans Related to Single Industry on Loans | 10.00% |  | 10.00% |  |  | 10.00% |  |
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans | 81.00% |  | 81.00% |  |  | 83.00% |  |
Loans and Leases Receivable, Related Parties | $ 282 |  | $ 282 |  |  | $ 292 |  | $ 547
Loans held for investment | $ 21,229,461 |  | $ 21,229,461 |  |  | $ 20,352,559 |  |
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate | 0.40% |  | 0.40% |  |  | 0.34% |  |
Loans and leases receivable, nonaccrual loans | $ 84,200 |  | $ 84,200 |  |  | $ 68,700 |  |
Financing Receivable, Allowance for Credit Losses on Loans | $ 359,900 |  | $ 359,900 |  |  | $ 332,400 |  |
Allowance for Credit Losses as Percentage of Loans | 1.61% |  | 1.61% |  |  | 1.57% |  |
Provision for credit losses | $ 7,923 | $ 11,984 | $ 7,923 | $ 11,984 |  |  |  |
Provision for credit losses | 9,066 | 18,540 | 9,066 | 18,540 |  |  |  |
Increase in allowance for credit losses for loans |  |  | $ 27,500 |  |  |  |  |
Increase in allowance for credit losses for loans, percentage |  |  | 8.30% |  |  |  |  |
Net charge-offs | 4,368 | 16,065 | $ 6,511 | 15,450 |  |  |  |
General reserve | 4,800 |  | 8,900 |  |  |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,646 | $ 36,503 | 37,646 | $ 36,503 | $ 36,503 | $ 36,503 | $ 29,947 | $ 29,947
Commitments expected to fund | 2,070,000 |  | 2,070,000 |  |  |  |  |
Nonaccrual loans | 84,175 |  | 84,175 |  |  | 68,688 |  |
LSSB Merger [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses | 7,900 |  |  |  |  |  |  |
Net charge-offs | 26,100 |  | 26,100 |  |  |  |  |
Troubled Debt Restructuring [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,600 |  | 37,600 |  |  | 36,500 |  |
Troubled Debt Restructuring [Member] | LSSB Merger [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses | 1,200 |  |  |  |  |  |  |
PCD Loans [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Net charge-offs | 878 |  | 1,900 |  |  |  |  |
Nonperforming Financial Instruments [Member] |  |  |  |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |  |  |  |
Loans held for investment | $ 89,600 |  | $ 89,600 |  |  | $ 72,700 |  |

X
- Definition Allowance for credit losses as percentage of loans. + References No definition available. + Details
Name: | pb_AllowanceForCreditLossesAsPercentageOfLoans
Namespace Prefix: | pb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Allowance for loan and lease losses general reserves. + References No definition available. + Details
Name: | pb_AllowanceForLoanAndLeaseLossesGeneralReserves
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Allowance for loans and lease losses period increase decrease. + References No definition available. + Details
Name: | pb_AllowanceForLoansAndLeaseLossesPeriodIncreaseDecrease
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Allowance for loans and lease losses writeoffs net. + References No definition available. + Details
Name: | pb_AllowanceForLoansAndLeaseLossesWriteoffsNet
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Commitments expected to fund. + References No definition available. + Details
Name: | pb_CommitmentsExpectedToFund
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Financing receivable ratio of nonperforming loans to all loans and other real estate. + References No definition available. + Details
Name: | pb_FinancingReceivableRatioOfNonperformingLoansToAllLoansAndOtherRealEstate
Namespace Prefix: | pb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Increase decrease in allowance for credit losses percent. + References No definition available. + Details
Name: | pb_IncreaseDecreaseInAllowanceForCreditLossesPercent
Namespace Prefix: | pb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans and lease receivable impaired nonperforming nonaccrual of interest. + References No definition available. + Details
Name: | pb_LoansAndLeaseReceivableImpairedNonperformingNonaccrualOfInterest
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and lease receivable net of deferred income. + References No definition available. + Details
Name: | pb_LoansAndLeaseReceivableNetOfDeferredIncome
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of loans related to single industry on total loans. + References No definition available. + Details
Name: | pb_PercentageOfLoansRelatedToSingleIndustryOnLoans
Namespace Prefix: | pb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of multiple industry loans aggregating to company loan portfolio excluding Warehouse Purchase Program loans. + References No definition available. + Details
Name: | pb_PercentageOfRealEstateLoansAggregatingToCompanyLoanPortfolioExcludingWarehousePurchaseProgramLoans
Namespace Prefix: | pb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Provision for credit losses. + References No definition available. + Details
Name: | pb_ProvisionForCreditLosses
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Provision for loans and lease losses. + References No definition available. + Details
Name: | pb_ProvisionForLoansAndLeaseLosses
Namespace Prefix: | pb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (1) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (3) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (3) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (2) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(e)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483326/850-10-50-1 + Details
Name: | us-gaap_LoansAndLeasesReceivableRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=pb_LSSBMergerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=pb_TroubledDebtRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_FinancialInstrumentPerformanceStatusAxis=pb_NonperformingFinancingReceivableAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |