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Schedule of PCI Loan Portfolio (Detail) - Marquette [Member] - USD ($)
$ in Thousands
9 Months Ended
May. 31, 2015
Sep. 30, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Fair value of purchased loans $ 980,400  
Loans Accounted for under ASC 310-30 [Member]    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Contractually required principal and interest at acquisition 9,282  
Non-accretable difference (1,307) $ (1,307)
Expected cash flows at acquisition 7,975  
Accretable yield (164) $ (14)
Fair value of purchased loans $ 7,811