XML 75 R68.htm IDEA: XBRL DOCUMENT
v3.25.3

Derivative Financial Instruments - Schedule of Weighted Average Received and Paid Interest Rates for Interest Rate Swaps Outstanding (Details) - Commercial Loan Interest Rate Swaps and Caps [Member] - Loan Customer Counterparty [Member] | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Weighted-Average Interest Rate Received | 5.55 | 5.03
Weighted-Average Interest Rate Paid | 6.48 | 6.77

X
- Definition Derivative weighted-average interest rate paid. + References No definition available. + Details
Name: | pb_DerivativeWeightedAverageInterestRatePaid
Namespace Prefix: | pb_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Derivative weighted-average interest rate received. + References No definition available. + Details
Name: | pb_DerivativeWeightedAverageInterestRateReceived
Namespace Prefix: | pb_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=pb_CommercialLoanInterestRateSwapAndCapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=pb_LoanCustomerCounterpartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |