XML 44 R43.htm IDEA: XBRL DOCUMENT v2.4.1.9
Loans and the Allowance for Loan Losses (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross $ 3,953,964us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 3,988,187us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loans and Leases Receivable, Net of Deferred Income 3,953,661us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 3,987,874us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Commercial, financial, agricultural    
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross 474,788us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 483,283us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Loans and Leases Receivable, Net of Deferred Income 474,788us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 483,283us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Lease financing    
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross 11,863us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember		 10,427us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
Real estate – construction    
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross 201,449us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 212,061us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Loans and Leases Receivable, Net of Deferred Income 201,449us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 212,061us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Real estate – 1-4 family mortgage    
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross 1,239,455us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember		 1,236,360us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Loans and Leases Receivable, Net of Deferred Income 1,239,455us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember		 1,236,360us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
Real estate – commercial mortgage    
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross 1,938,994us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		 1,956,914us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Loans and Leases Receivable, Net of Deferred Income 1,938,994us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember		 1,956,914us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Installment loans to individuals    
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross 87,415us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember		 89,142us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
Loans and Leases Receivable, Net of Deferred Income 98,975us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember		 [1] 99,256us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember		 [1]
Unearned income    
Past due and nonaccrual loans    
Loans and Leases Receivable, Gross (303)us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember		 (313)us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
Accruing Loans    
Past due and nonaccrual loans    
30-89 Days Past Due 18,582rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 17,166rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 10,829us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 10,713us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans 3,886,864us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 3,915,598us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing 3,916,275rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 3,943,477rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Accruing Loans | Commercial, financial, agricultural    
Past due and nonaccrual loans    
30-89 Days Past Due 684rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 1,113rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 1,506us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 636us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans 471,674us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 480,332us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing 473,864rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 482,081rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Accruing Loans | Lease financing    
Past due and nonaccrual loans    
30-89 Days Past Due 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 462rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans 11,441us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 9,965us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing 11,441rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 10,427rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Accruing Loans | Real estate – construction    
Past due and nonaccrual loans    
30-89 Days Past Due 71rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 37us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 37us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans 201,070us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 211,860us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing 201,178rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 211,897rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Accruing Loans | Real estate – 1-4 family mortgage    
Past due and nonaccrual loans    
30-89 Days Past Due 7,806rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 8,398rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 1,852us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 2,382us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans 1,216,794us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 1,212,214us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing 1,226,452rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 1,222,994rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Accruing Loans | Real estate – commercial mortgage    
Past due and nonaccrual loans    
30-89 Days Past Due 9,655rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 6,924rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 7,417us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 7,637us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans 1,899,224us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 1,912,758us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing 1,916,296rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 1,927,319rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Accruing Loans | Installment loans to individuals    
Past due and nonaccrual loans    
30-89 Days Past Due 366rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 269rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 17us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 21us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans 86,964us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 88,782us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing 87,347rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 89,072rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Accruing Loans | Unearned income    
Past due and nonaccrual loans    
30-89 Days Past Due 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
90 Days or More Past Due 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Current Loans (303)us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 (313)us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Total Loans, Accruing (303)rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember		 (313)rnst_FinancingReceivableRecordedInvestmentAccruing
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_AccruingLoansMember
Nonaccruing Loans    
Past due and nonaccrual loans    
30-89 Days Past Due 1,406rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 2,197rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 19,255us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 22,575us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 16,725us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 19,625us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring 37,386us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 44,397us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Nonaccruing Loans | Commercial, financial, agricultural    
Past due and nonaccrual loans    
30-89 Days Past Due 34rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 16rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 545us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 820us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 345us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 366us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring 924us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 1,202us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Nonaccruing Loans | Lease financing    
Past due and nonaccrual loans    
30-89 Days Past Due 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 422us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring 422us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Nonaccruing Loans | Real estate – construction    
Past due and nonaccrual loans    
30-89 Days Past Due 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 271us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 164us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring 271us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 164us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Nonaccruing Loans | Real estate – 1-4 family mortgage    
Past due and nonaccrual loans    
30-89 Days Past Due 309rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 355rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 5,244us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 4,604us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 7,450us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 8,407us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring 13,003us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 13,366us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= rnst_RealEstateOneToFourFamilyMortgageMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Nonaccruing Loans | Real estate – commercial mortgage    
Past due and nonaccrual loans    
30-89 Days Past Due 1,063rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 1,826rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 12,714us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 16,928us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 8,921us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 10,841us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring 22,698us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 29,595us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Nonaccruing Loans | Installment loans to individuals    
Past due and nonaccrual loans    
30-89 Days Past Due 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 59us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 59us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 9us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 11us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring 68us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 70us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= rnst_InstallmentLoansToIndividualsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Nonaccruing Loans | Unearned income    
Past due and nonaccrual loans    
30-89 Days Past Due 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0rnst_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
90 Days or More Past Due 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Current Loans 0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 0us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
Total Loans, Nonaccuring $ 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember		 $ 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= rnst_UnearnedIncomeMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rnst_NonaccruingLoansMember
[1] Includes lease financing receivables.