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SHORT-TERM BORROWINGS - Information Concerning Short-Term Borrowing (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]      
Balance at year end $ 65,000orrf_ShortTermBorrowingsOtherThanRepurchaseAgreements $ 50,000orrf_ShortTermBorrowingsOtherThanRepurchaseAgreements $ 0orrf_ShortTermBorrowingsOtherThanRepurchaseAgreements
Weighted average interest rate at year-end 0.36%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.28%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate
Average balance during the year 32,736us-gaap_ShorttermDebtAverageOutstandingAmount 10,540us-gaap_ShorttermDebtAverageOutstandingAmount 11,509us-gaap_ShorttermDebtAverageOutstandingAmount
Average interest rate during the year 0.34%us-gaap_DebtInstrumentInterestRateDuringPeriod 0.31%us-gaap_DebtInstrumentInterestRateDuringPeriod 0.40%us-gaap_DebtInstrumentInterestRateDuringPeriod
Maximum month-end balance during the year $ 65,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount $ 50,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount $ 20,000us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount