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Office Properties and Equipment - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2020
USD ($)
property
Property, Plant and Equipment [Line Items]        
Depreciation expense $ 2,875 $ 2,504 $ 1,959  
Held for sale        
Property, Plant and Equipment [Line Items]        
Carrying value of office property held for sale $ 1,275      
Expected | Expected sale        
Property, Plant and Equipment [Line Items]        
Carrying value of office property held for sale       $ 410
Number of properties held for sale expected to close | property       2