ASC 310-30 Loans Acquired at Acquisition Date (Detail) - FDIC Assisted Partial Acquisition Of Doral Bank [Member] - A S C Subtopic 31030 [Member] $ in Thousands	Feb. 27, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period Contractually Required Payments Receivable At Acquisition	$ 233,987
Certain Loans Acquired In Transfer Nonaccretable Difference	43,904
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period Cash Flows Expected To Be Collected At Acquisition	190,083
Certain Loans Acquired In Transfer Accretable Yield	46,150
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Acquired During Period At Acquisition At Fair Value	$ 143,933