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v2.4.1.9

Segments - Financial Information of Segments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Interest income | $ 43,916 us-gaap_InterestAndDividendIncomeOperating | $ 38,665 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 3,657 us-gaap_InterestExpense | 3,074 us-gaap_InterestExpense
NET INTEREST INCOME | 40,259 us-gaap_InterestIncomeExpenseNet | 35,591 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 1,207 us-gaap_ProvisionForLoanAndLeaseLosses | 289 us-gaap_ProvisionForLoanAndLeaseLosses
Noninterest income | 12,084 us-gaap_NoninterestIncome | 11,416 us-gaap_NoninterestIncome
Noninterest expense | 32,243 stba_NoninterestExpenseBySegment | 27,777 stba_NoninterestExpenseBySegment
Depreciation expense | 1,030 us-gaap_Depreciation | 821 us-gaap_Depreciation
Amortization of intangible assets | 348 us-gaap_AmortizationOfIntangibleAssets | 316 us-gaap_AmortizationOfIntangibleAssets
Provision for income taxes | 4,680 us-gaap_IncomeTaxExpenseBenefit | 3,771 us-gaap_IncomeTaxExpenseBenefit
Net Income | 12,835 us-gaap_NetIncomeLoss | 14,033 us-gaap_NetIncomeLoss
Operating Segments [Member] | Community Banking [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Interest income | 43,887 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 38,630 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Interest expense | 3,889 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 3,482 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
NET INTEREST INCOME | 39,998 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 35,148 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Provision for loan losses | 1,207 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 289 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Noninterest income | 7,537 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 6,854 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Noninterest expense | 28,687 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 23,973 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Depreciation expense | 1,011 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 803 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Amortization of intangible assets | 326 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 292 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Provision for income taxes | 4,256 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 3,365 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Net Income | 12,048 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember | 13,280 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_CommunityBankingMember
Operating Segments [Member] | Insurance [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Interest income | 0 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 0 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Interest expense | 0 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 0 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
NET INTEREST INCOME | 0 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 0 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Provision for loan losses | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Noninterest income | 1,553 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 1,521 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Noninterest expense | 1,137 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 1,155 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Depreciation expense | 12 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 11 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Amortization of intangible assets | 13 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 13 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Provision for income taxes | 137 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 120 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Net Income | 254 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember | 222 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_InsuranceMember
Operating Segments [Member] | Wealth Management [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Interest income | 140 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 174 us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Interest expense | 0 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 0 us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
NET INTEREST INCOME | 140 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 174 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Provision for loan losses | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Noninterest income | 2,916 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 2,935 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Noninterest expense | 2,220 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 2,274 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Depreciation expense | 7 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 7 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Amortization of intangible assets | 9 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 11 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Provision for income taxes | 287 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 286 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Net Income | 533 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember | 531 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = stba_WealthManagementMember
Eliminations [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Interest income | (111)us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (139)us-gaap_InterestAndDividendIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Interest expense | (232)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | (408)us-gaap_InterestExpense / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
NET INTEREST INCOME | 121 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 269 us-gaap_InterestIncomeExpenseNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Provision for loan losses | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Noninterest income | 78 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 106 us-gaap_NoninterestIncome / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Noninterest expense | 199 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 375 stba_NoninterestExpenseBySegment / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Depreciation expense | 0 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Amortization of intangible assets | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Provision for income taxes | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | 0 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Net Income | $ 0 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember | $ 0 us-gaap_NetIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
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