XML 75 R48.htm IDEA: XBRL DOCUMENT
v3.22.2

Allowance for Credit Losses - Allowance for Credit Loss Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | $ 99,915 | $ 115,101 | $ 98,576 | $ 117,612
Provision for credit losses on loans | 1,192 | 2,008 | 495 | 5,308
Charge-offs | (7,678) | (8,737) | (8,661) | (15,270)
Recoveries | 4,666 | 1,264 | 7,685 | 1,985
Net Recoveries/(Charge-offs) | (3,012) | (7,473) | (976) | (13,285)
Balance at End of Period | 98,095 | 109,636 | 98,095 | 109,636
Commercial Loans | Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 48,903 | 66,842 | 50,700 | 65,656
Provision for credit losses on loans | (3,678) | 2,937 | (5,475) | 4,933
Charge-offs | (199) | (7,558) | (199) | (8,369)
Recoveries | 288 | 965 | 288 | 965
Net Recoveries/(Charge-offs) | 89 | (6,594) | 89 | (7,403)
Balance at End of Period | 45,314 | 63,186 | 45,314 | 63,186
Commercial Loans | Commercial and industrial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 22,237 | 14,663 | 19,727 | 16,100
Provision for credit losses on loans | 948 | 225 | 768 | 2,953
Charge-offs | (5,797) | (473) | (5,798) | (4,774)
Recoveries | 4,138 | 11 | 6,829 | 148
Net Recoveries/(Charge-offs) | (1,659) | (462) | 1,031 | (4,627)
Balance at End of Period | 21,526 | 14,426 | 21,526 | 14,426
Commercial Loans | Commercial construction |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 5,329 | 6,329 | 5,355 | 7,239
Provision for credit losses on loans | 1,254 | (426) | 1,227 | (1,337)
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 2 | 1 | 3
Net Recoveries/(Charge-offs) | 0 | 2 | 1 | 3
Balance at End of Period | 6,583 | 5,905 | 6,583 | 5,905
Commercial Loans | Business banking |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 11,497 | 15,680 | 11,338 | 15,917
Provision for credit losses on loans | 1,668 | (560) | 2,207 | (46)
Charge-offs | (1,141) | (410) | (1,746) | (1,327)
Recoveries | 133 | 47 | 358 | 213
Net Recoveries/(Charge-offs) | (1,008) | (363) | (1,388) | (1,115)
Balance at End of Period | 12,157 | 14,756 | 12,157 | 14,756
Consumer Loans | Consumer real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 9,118 | 8,981 | 8,733 | 10,014
Provision for credit losses on loans | 582 | (410) | 1,010 | (1,254)
Charge-offs | (60) | (76) | (138) | (347)
Recoveries | 33 | 152 | 68 | 234
Net Recoveries/(Charge-offs) | (27) | 76 | (70) | (113)
Balance at End of Period | 9,673 | 8,647 | 9,673 | 8,647
Consumer Loans | Other Consumer |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 2,831 | 2,606 | 2,723 | 2,686
Provision for credit losses on loans | 418 | 243 | 758 | 61
Charge-offs | (481) | (221) | (780) | (453)
Recoveries | 74 | 88 | 141 | 423
Net Recoveries/(Charge-offs) | (407) | (132) | (639) | (30)
Balance at End of Period | $ 2,842 | $ 2,717 | $ 2,842 | $ 2,717

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossWriteoffAfterRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_BusinessBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_ConsumerRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=stba_OtherConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |