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Premises and Equipment (Composition of Premises and Equipment) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 60,462 $ 54,168
Less accumulated depreciation (22,607) (23,287)
Premises and equipment, net 37,855 30,881
Land [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 7,035 7,035
Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 1,343 1,203
Premises [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 30,848 25,150
Furniture and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment 20,702 20,246
Capital Lease [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment $ 534 $ 534