Quarterly report pursuant to Section 13 or 15(d)

Loans - Schedule of Changes in Outstanding Balance and Carrying Amount of PCI Loans (Detail)

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Loans - Schedule of Changes in Outstanding Balance and Carrying Amount of PCI Loans (Detail) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Total
Carrying Amount    
Balance at beginning of period   $ 2,735,832
Balance at end of period $ 2,874,172 2,874,172
PCI Loans [Member]    
Carrying Amount    
Balance at beginning of period   43,475
Accretion   1,758
Payment received   (13,792)
Disposals/transfers to OREO   1,441
Change in expected cash flows, net   0
Provision for credit losses (216) (326)
Balance at end of period 33,908 33,908
Accretable Yield    
Balance at beginning of period   (11,025)
Accretion   1,758
Payment received   0
Disposals/transfers to OREO   0
Change in expected cash flows, net   92
Provision for credit losses   0
Balance at end of period $ (9,175) $ (9,175)