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Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Total Cost $ 16,743 $ 6,463
Less: Accumulated depreciation (3,092) (3,120)
Total, net of depreciation 13,651 3,343
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Total Cost 12,535 3,109
Construction in Progress [Member]    
Property Plant And Equipment [Line Items]    
Total Cost 443  
Furniture, Fixtures and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Total Cost 3,411 2,977
Software [Member]    
Property Plant And Equipment [Line Items]    
Total Cost $ 354 $ 377