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Other Real Estate Owned - Activity in Other Real Estate Owned (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate Properties [Line Items]        
Other real estate owned and repossessed personal property $ 2,169 $ 3,232 $ 8,810 $ 18,546
Repossessed personal property $ 400 300    
Other Real Estate Owned [Member] | Klein Bank [Member]        
Real Estate Properties [Line Items]        
Other real estate owned and repossessed personal property   $ 1,000    
Other Real Estate Owned [Member] | Anchor Bank (MN) [Member]        
Real Estate Properties [Line Items]        
Other real estate owned and repossessed personal property     $ 1,100