XML 13 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loans receivable (Details 8) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
item
Troubled debt restructurings    
Number of contracts 3us-gaap_FinancingReceivableModificationsNumberOfContracts2 11us-gaap_FinancingReceivableModificationsNumberOfContracts2
Total $ 196us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 $ 1,483us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Payment    
Troubled debt restructurings    
Total   102us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_PaymentModificationMember
Maturity date    
Troubled debt restructurings    
Total 112us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember		 1,348us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember
Other    
Troubled debt restructurings    
Total   33us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_OtherModificationMember
Personal Banking    
Troubled debt restructurings    
Number of contracts 3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember		 6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
Total 196us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember		 1,289us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
Personal Banking | Rate    
Troubled debt restructurings    
Total 84us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_InterestRateModificationMember		  
Personal Banking | Maturity date    
Troubled debt restructurings    
Total 112us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember		 1,289us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember
Personal Banking | Residential mortgage loans    
Troubled debt restructurings    
Number of contracts 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember		 6us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
Total 112us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember		 1,289us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
Personal Banking | Residential mortgage loans | Maturity date    
Troubled debt restructurings    
Total 112us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember		 1,289us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ResidentialMortgageMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember
Personal Banking | Home equity loans    
Troubled debt restructurings    
Number of contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember		  
Total 84us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember		  
Personal Banking | Home equity loans | Rate    
Troubled debt restructurings    
Total 84us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_PersonalBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_InterestRateModificationMember		  
Business Banking    
Troubled debt restructurings    
Number of contracts   5us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
Total   194us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
Business Banking | Payment    
Troubled debt restructurings    
Total   102us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_PaymentModificationMember
Business Banking | Maturity date    
Troubled debt restructurings    
Total   59us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember
Business Banking | Other    
Troubled debt restructurings    
Total   33us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_OtherModificationMember
Business Banking | Commercial real estate loans    
Troubled debt restructurings    
Number of contracts   3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
Total   87us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
Business Banking | Commercial real estate loans | Maturity date    
Troubled debt restructurings    
Total   59us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_MaturityDateModificationMember
Business Banking | Commercial real estate loans | Other    
Troubled debt restructurings    
Total   28us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_OtherModificationMember
Business Banking | Commercial loans    
Troubled debt restructurings    
Number of contracts   2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
Total   107us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
Business Banking | Commercial loans | Payment    
Troubled debt restructurings    
Total   102us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_PaymentModificationMember
Business Banking | Commercial loans | Other    
Troubled debt restructurings    
Total   $ 5us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nwbi_BusinessBankingMember
/ nwbi_FinancingReceivableTroubledDebtRestructuringByTypesOfConcessionsMadeAxis
= nwbi_OtherModificationMember