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Loans and Leases - Summary of Changes in Accretable Yield for Acquired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Purchased Impaired [Member]      
Summary of changes in Accretable Yield for acquired loans      
Balance at beginning of period $ 76,518 $ 37,230 $ 42,252
Additions 117,251    
Interest income (28,551) (21,263) (36,727)
Reclassifications from nonaccretable balance, net 19,400 60,551 31,705
Balance at end of period 184,618 76,518 37,230
Other Acquired [Member]      
Summary of changes in Accretable Yield for acquired loans      
Balance at beginning of period 397,379 538,633 638,272
Interest income (158,260) (178,670) (247,295)
Reclassifications from nonaccretable balance, net 49,930 24,907 149,595
Other 7,385 12,509 (1,939)
Balance at end of period $ 296,434 $ 397,379 $ 538,633