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) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Carrying Amount    
Balance at beginning of period $ 3,140,381  
Ending balance 3,449,310  
PCI Loans [Member]    
Carrying Amount    
Balance at beginning of period 14,573 $ 43,475
Accretion 753 1,758
Payments received (6,713) (13,792)
Disposal/transfer to OREO 1,103 1,441
Change in expected cash flows, net 0 0
Provision for credit losses (144) (326)
Ending balance 15,020 33,908
Accretable Yield    
Balance at beginning of period (5,944) (11,025)
Accretion 753 1,758
Payments received 0 0
Disposal/transfer to OREO 0 0
Change in expected cash flows, net 683 92
Provision for credit losses 0 0
Balance at end of period $ (4,508) $ (9,175)