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Other Real Estate Owned - Activity in Other Real Estate Owned (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Nov. 30, 2018
Other Real Estate [Roll Forward]            
Balance at beginning of period $ 2,169 $ 3,232 $ 8,810      
Additions 965 1,192 2,025      
Sales (1,505) (2,077) (6,689)      
Impairments (305) (178) (914)      
Balance at end of period 1,324 2,169 3,232      
Other Real Estate $ 2,169 $ 3,232 $ 3,232 $ 1,324 $ 2,169  
Repossessed personal property       $ 200 $ 400  
Klein Bank | Other Real Estate Owned            
Other Real Estate [Roll Forward]            
Other Real Estate           $ 1,000