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Acquisitions and Divestiture - Summary of Acquired Impaired Loans (Detail) - Hudson City [Member]
$ in Thousands
Nov. 01, 2015
USD ($)
Financing Receivable, Impaired [Line Items]  
Contractually required principal and interest at acquisition $ 1,304,366
Contractual cash flows not expected to be collected (498,919)
Expected cash flows at acquisition 805,447
Interest component of expected cash flows (117,251)
Estimated fair value $ 688,196