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Borrowed Funds - Schedule of Borrowed Funds (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 246,571us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 246,322us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
FHLB line of credit 73,000pfs_FederalHomeLoanBankLineOfCredit 183,000pfs_FederalHomeLoanBankLineOfCredit
FHLB advances 1,190,280us-gaap_AdvancesFromFederalHomeLoanBanks 774,557us-gaap_AdvancesFromFederalHomeLoanBanks
Borrowed funds $ 1,509,851us-gaap_OtherBorrowings $ 1,203,879us-gaap_OtherBorrowings