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SECURITIES AVAILABLE FOR SALE - Schedule of Amortized Cost and Fair Values of Securities Available for Sale by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Amortized Cost    
Due in one year or less $ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through five years 380us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years through ten years 22,429us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years 53,679us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Mortgage-backed securities and collateralized mortgage obligations 297,237orrf_AvailableForSaleSecuritiesMortgageBackedSecuritiesAndCollateralizedMortgageObligationsAmortizedCost  
Total debt securities 373,725us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 414,298us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Equity securities 50us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis 50us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Available for sale securities, Total 373,775us-gaap_AvailableForSaleSecuritiesAmortizedCost 414,348us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value    
Due in one year or less 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years 381us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years 22,392us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years 53,586us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Mortgage-backed securities and collateralized mortgage obligations 299,773orrf_AvailableForSaleSecuritiesMortgageBackedSecuritiesAndCollateralizedMortgageObligationsFairValue  
Total debt securities 376,132us-gaap_AvailableForSaleSecuritiesDebtSecurities 406,874us-gaap_AvailableForSaleSecuritiesDebtSecurities
Equity securities 67us-gaap_AvailableForSaleSecuritiesEquitySecurities 69us-gaap_AvailableForSaleSecuritiesEquitySecurities
Available for Sale $ 376,199us-gaap_AvailableForSaleSecurities $ 406,943us-gaap_AvailableForSaleSecurities