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Loans and Loans Held for Sale - Composition of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Composition of the loans    
Commercial Loans $ 3,649,632us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 2,892,522us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
Consumer Loans 1,034,066us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer 976,224us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
Total Portfolio Loans 4,683,698us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1] 3,868,746us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1]
Loans held for sale 6,126us-gaap_LoansReceivableHeldForSaleNet 2,970us-gaap_LoansReceivableHeldForSaleNet
Total Loans 4,689,824us-gaap_LoansReceivableNet 3,871,716us-gaap_LoansReceivableNet
Commercial Real Estate [Member]    
Composition of the loans    
Commercial Loans 2,152,413us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
1,682,236us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Total Portfolio Loans 2,152,413us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
[1] 1,682,236us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
[1]
Total Loans 2,152,413us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
1,682,236us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Commercial and Industrial [Member]    
Composition of the loans    
Commercial Loans 1,211,053us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialAndIndustrialMember
994,138us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialAndIndustrialMember
Total Portfolio Loans 1,211,053us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialAndIndustrialMember
[1] 994,138us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialAndIndustrialMember
[1]
Total Loans 1,211,053us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialAndIndustrialMember
994,138us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialAndIndustrialMember
Commercial Construction [Member]    
Composition of the loans    
Commercial Loans 286,166us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialConstructionMember
216,148us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialConstructionMember
Total Portfolio Loans 286,166us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialConstructionMember
[1] 216,148us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialConstructionMember
[1]
Total Loans 286,166us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialConstructionMember
216,148us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_CommercialConstructionMember
Residential Mortgage [Member]    
Composition of the loans    
Consumer Loans 521,506us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
489,586us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Total Loans 521,506us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
489,586us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Home Equity [Member]    
Composition of the loans    
Consumer Loans 442,396us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
418,563us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Total Loans 442,396us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
418,563us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Installment and Other Consumer [Member]    
Composition of the loans    
Consumer Loans 65,754us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_InstallmentAndOtherConsumerMember
65,567us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_InstallmentAndOtherConsumerMember
Total Loans 65,754us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_InstallmentAndOtherConsumerMember
65,567us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_InstallmentAndOtherConsumerMember
Consumer Construction [Member]    
Composition of the loans    
Consumer Loans 4,410us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_ConsumerConstructionMember
2,508us-gaap_LoansAndLeasesReceivableGrossCarryingAmountConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_ConsumerConstructionMember
Total Loans $ 4,410us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_ConsumerConstructionMember
$ 2,508us-gaap_LoansReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= stba_ConsumerConstructionMember
[1] (1) Includes acquired loans.