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Schedule of PCI Loan Portfolio (Detail) - Loans Accounted for under ASC 310-30 [Member] - Marquette [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
May. 31, 2015
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 $ (102) (164)
Fair value of purchased loans   $ 7,811