Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Loans	$ 199,844	$ 158,947	$ 137,800
Securities
Taxable	17,096us-gaap_InterestIncomeSecuritiesTaxable	13,397us-gaap_InterestIncomeSecuritiesTaxable	13,120us-gaap_InterestIncomeSecuritiesTaxable
Tax-exempt	9,073	8,012	8,194
Other	396us-gaap_OtherInterestAndDividendIncome	248us-gaap_OtherInterestAndDividendIncome	199us-gaap_OtherInterestAndDividendIncome
Total interest income	226,409	180,604	159,313
Interest expense
Deposits	16,069us-gaap_InterestExpenseDeposits	17,050us-gaap_InterestExpenseDeposits	19,030us-gaap_InterestExpenseDeposits
Borrowings	7,711us-gaap_InterestExpenseBorrowings	6,353us-gaap_InterestExpenseBorrowings	6,945us-gaap_InterestExpenseBorrowings
Total interest expense	23,780us-gaap_InterestExpense	23,403us-gaap_InterestExpense	25,975us-gaap_InterestExpense
Net interest income	202,629us-gaap_InterestIncomeExpenseNet	157,201us-gaap_InterestIncomeExpenseNet	133,338us-gaap_InterestIncomeExpenseNet
Provision for loan losses	6,167us-gaap_ProvisionForLoanAndLeaseLosses	10,350us-gaap_ProvisionForLoanAndLeaseLosses	18,125us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	196,462	146,851	115,213
Noninterest income
Service charges on deposit accounts	25,383	20,535	18,612
Fees and commissions	21,873us-gaap_FeesAndCommissions	19,961us-gaap_FeesAndCommissions	17,595us-gaap_FeesAndCommissions
Insurance commissions	8,194us-gaap_InsuranceCommissionsAndFees	4,976us-gaap_InsuranceCommissionsAndFees	3,630us-gaap_InsuranceCommissionsAndFees
Wealth management revenue	8,655	7,654	6,926
Net gains on sales of securities	375us-gaap_GainLossOnSaleOfSecuritiesNet	54us-gaap_GainLossOnSaleOfSecuritiesNet	1,894us-gaap_GainLossOnSaleOfSecuritiesNet
BOLI income	2,985us-gaap_BankOwnedLifeInsuranceIncome	4,085us-gaap_BankOwnedLifeInsuranceIncome	3,370us-gaap_BankOwnedLifeInsuranceIncome
Gains on sales of mortgage loans held for sale	8,594us-gaap_GainLossOnSaleOfMortgageLoans	11,573us-gaap_GainLossOnSaleOfMortgageLoans	12,499us-gaap_GainLossOnSaleOfMortgageLoans
Other	4,561	3,133	4,185
Total noninterest income	80,620us-gaap_NoninterestIncome	71,971us-gaap_NoninterestIncome	68,711us-gaap_NoninterestIncome
Noninterest expense
Salaries and employee benefits	115,108us-gaap_LaborAndRelatedExpense	98,780us-gaap_LaborAndRelatedExpense	81,002us-gaap_LaborAndRelatedExpense
Data processing	11,400	8,870	8,724
Net occupancy and equipment	20,252rnst_NetOccupancyAndEquipment	16,957rnst_NetOccupancyAndEquipment	14,597rnst_NetOccupancyAndEquipment
Other real estate owned	4,593us-gaap_ForeclosedRealEstateExpense	6,966us-gaap_ForeclosedRealEstateExpense	13,596us-gaap_ForeclosedRealEstateExpense
Professional fees	4,485us-gaap_ProfessionalFees	5,540us-gaap_ProfessionalFees	4,241us-gaap_ProfessionalFees
Advertising and public relations	5,923us-gaap_AdvertisingExpense	5,630us-gaap_AdvertisingExpense	4,835us-gaap_AdvertisingExpense
Intangible amortization	5,606us-gaap_AmortizationOfIntangibleAssets	2,869us-gaap_AmortizationOfIntangibleAssets	1,381us-gaap_AmortizationOfIntangibleAssets
Communications	5,949us-gaap_Communication	5,147us-gaap_Communication	4,212us-gaap_Communication
Merger-related expenses	694	6,027	0
Extinguishment of debt	0	0	898
Other	17,185us-gaap_OtherNoninterestExpense	16,290us-gaap_OtherNoninterestExpense	16,973us-gaap_OtherNoninterestExpense
Total noninterest expense	191,195us-gaap_NoninterestExpense	173,076us-gaap_NoninterestExpense	150,459us-gaap_NoninterestExpense
Income before income taxes	85,887	45,746	33,465
Income taxes	26,305us-gaap_IncomeTaxExpenseBenefit	12,259us-gaap_IncomeTaxExpenseBenefit	6,828us-gaap_IncomeTaxExpenseBenefit
Net income	$ 59,582us-gaap_NetIncomeLoss	$ 33,487us-gaap_NetIncomeLoss	$ 26,637us-gaap_NetIncomeLoss
Basic earnings per share (usd per share)	$ 1.89us-gaap_EarningsPerShareBasic	$ 1.23us-gaap_EarningsPerShareBasic	$ 1.06us-gaap_EarningsPerShareBasic
Diluted earnings per share (usd per share)	$ 1.88us-gaap_EarningsPerShareDiluted	$ 1.22us-gaap_EarningsPerShareDiluted	$ 1.06us-gaap_EarningsPerShareDiluted
Cash dividends per common share (usd per share)	$ 0.68	$ 0.68	$ 0.68

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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Amount of expense recognized during the period for the foreclosure on real estate assets.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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