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Other Noninterest Expense - Summary of Other Noninterest Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other noninterest expenses:      
Joint venture amortization $ 4,054stba_JointVentureAmortization $ 4,095stba_JointVentureAmortization $ 4,199stba_JointVentureAmortization
Loan related expenses 2,579stba_LoanRelatedExpenses 2,432stba_LoanRelatedExpenses 2,538stba_LoanRelatedExpenses
Communication 2,220us-gaap_Communication 1,691us-gaap_Communication 1,415us-gaap_Communication
Amortization of intangibles 1,129us-gaap_AmortizationOfIntangibleAssets 1,591us-gaap_AmortizationOfIntangibleAssets 1,709us-gaap_AmortizationOfIntangibleAssets
Other real estate owned 264us-gaap_ForeclosedRealEstateExpense 445us-gaap_ForeclosedRealEstateExpense 2,166us-gaap_ForeclosedRealEstateExpense
Other 11,224us-gaap_OtherExpenses 10,661us-gaap_OtherExpenses 12,815us-gaap_OtherExpenses
Total Other Noninterest Expenses $ 21,470us-gaap_OtherNoninterestExpense $ 20,915us-gaap_OtherNoninterestExpense $ 24,842us-gaap_OtherNoninterestExpense