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Loans and Leases - Summary of Acquisition of Purchased Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended
Feb. 13, 2016
Jun. 30, 2016
Jun. 30, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]      
Contractually required cash flows at acquisition $ 2,291,087    
Non-accretable difference (expected losses and foregone interest) (317,228)    
Cash flows expected to be collected at acquisition 1,973,859    
Accretable yield (308,311) $ (49,646) $ (31,656)
Basis in acquired loans at acquisition 1,665,548    
Acquired Impaired Loans [Member]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]      
Contractually required cash flows at acquisition 99,611    
Non-accretable difference (expected losses and foregone interest) (52,995)    
Cash flows expected to be collected at acquisition 46,616    
Accretable yield (1,063)    
Basis in acquired loans at acquisition 45,553    
Acquired Performing Loans [Member]      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]      
Contractually required cash flows at acquisition 2,191,476    
Non-accretable difference (expected losses and foregone interest) (264,233)    
Cash flows expected to be collected at acquisition 1,927,243    
Accretable yield (307,248)    
Basis in acquired loans at acquisition $ 1,619,995