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Securities - Carrying Value of Held-to-Maturity Investment Securities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]    
Amortized cost $ 481,340ocfc_HeldToMaturitySecuritiesAmortizedCost $ 508,740ocfc_HeldToMaturitySecuritiesAmortizedCost
Net loss on date of transfer from available-for-sale (13,347)ocfc_OtherComprehensiveIncomeLossTransfersFromAvailableForSaleSecuritiesToHeldToMaturity (13,347)ocfc_OtherComprehensiveIncomeLossTransfersFromAvailableForSaleSecuritiesToHeldToMaturity
Accretion of unrealized loss on securities reclassified to held- to-maturity 1,424ocfc_OtherComprehensiveIncomeAccretionOfNetUnrealizedLossesOnHeldToMaturitySecuritiesBeforeTax 206ocfc_OtherComprehensiveIncomeAccretionOfNetUnrealizedLossesOnHeldToMaturitySecuritiesBeforeTax
Carrying value $ 469,417us-gaap_HeldToMaturitySecurities $ 495,599us-gaap_HeldToMaturitySecurities