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Office Properties and Equipment - Summary of Office Properties and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Total office properties and equipment $ 65,108 $ 63,542
Less accumulated depreciation 18,683 16,418
Total office properties and equipment, net 46,425 47,124
Land    
Property, Plant and Equipment [Line Items]    
Total office properties and equipment 14,245 14,034
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Total office properties and equipment 36,364 34,311
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total office properties and equipment $ 14,499 $ 15,197