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Other Real Estate Owned - Summary of Number and Carrying Values of Properties in Other Real Estate Owned (Detail)
$ in Thousands
Sep. 30, 2021
USD ($)
Property
Dec. 31, 2020
Property
Other Real Estate Owned [Line Items]    
Number of Properties 4 1
Carrying Value | $ $ 227  
Residential    
Other Real Estate Owned [Line Items]    
Number of Properties   1
Land    
Other Real Estate Owned [Line Items]    
Number of Properties 4  
Carrying Value | $ $ 227