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Loans and Allowance for Credit Losses on Loans - Purchases, Sales, and Transfers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Receivables [Abstract] |  |  |  |
Transfer of loans to held-for-investment | $ 0 | $ 0 | $ 0 | $ 0
Purchases of loans held-for-investment | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Financing Receivable, Excluding Accrued Interest, Reclassification to Held-for-investment + References No definition available. + Details
Name: | pcb_FinancingReceivableExcludingAccruedInterestReclassificationToHeldForInvestment
Namespace Prefix: | pcb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount excluding accrued interest, of increase in financing receivable from purchase. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-11 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestPurchase
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration