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, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
PCI Loans [Member]
Carrying Amount      
Balance at beginning of period $ 2,675,959 $ 2,159,271  
Additions from CBI acquisition     75,878
Accretion     491
Payment received     (5,892)
Disposals/transfers to OREO     (3,453)
Balance at end of period 2,675,959 2,159,271 67,024
Accretable Yield      
Additions from CBI acquisition     (22,858)
Accretion     491
Payment received       
Disposals/transfers to OREO     212
Balance at end of period     $ (22,155)