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Other Real Estate Owned - Activity in Other Real Estate Owned (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Real Estate Properties [Line Items]        
Othe real estate $ 11,071 $ 18,546 $ 24,254 $ 12,498
Repossessed personal property $ 200   200  
Anchor BanCorp Wisconsin Inc [Member] | Other Real Estate Owned [Member]        
Real Estate Properties [Line Items]        
Othe real estate     $ 18,200