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Premises and Equipment - Major Categories of Banking Premises and Equipment and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 57,841 $ 45,609
Less: Accumulated depreciation (31,558) (22,997)
Premises and Equipment (Net) 26,283 22,612
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 6,951 5,917
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) 28,845 24,489
Furnishings [Member]    
Property, Plant and Equipment [Line Items]    
Premises and Equipment (Gross) $ 22,045 $ 15,203