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Loans and Leases - Summary of Change in Accretable Yield of Acquired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Feb. 13, 2016
Dec. 31, 2016
Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract]      
Balance at beginning of period   $ 256,120 $ 331,899
Acquisitions   308,312  
Reduction due to unexpected early payoffs   (86,046) (47,075)
Reclass from non-accretable difference   92,823 32,141
Disposals/transfers   (409) (674)
Accretion $ (308,311) (103,730) (60,171)
Balance at end of period   $ 467,070 $ 256,120