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
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Carrying Amount      
Balance at beginning of period   $ 2,735,832  
Balance at end of period $ 3,045,072 3,045,072  
PCI Loans [Member]      
Carrying Amount      
Balance at beginning of period   43,475 $ 0
Additions from CBI acquisition at August 31, 2014     75,878
Accretion   2,462 491
Payment received   (26,060) (5,892)
Disposals/transfers to OREO   (4,242) (3,453)
Change in expected cash flows, net   0  
Provision for credit losses (1,786) (2,112)  
Balance at end of period 25,145 25,145  
Accretable Yield      
Balance at beginning of period   (11,025) 0
Additions from CBI acquisition at August 31, 2014     (22,858)
Accretion   2,462 491
Payment received   0 0
Disposals/transfers to OREO   0 212
Change in expected cash flows, net   1,349  
Provision for credit losses   0  
Balance at end of period $ (7,214) $ (7,214) $ (22,155)