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Bank Premises and Equipment, Net (Major Classes of Bank Premises and Equipment and Total Accumulated Depreciation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Bank premises and equipment, gross $ 33,500 $ 33,088
Less accumulated depreciation 14,775 13,791
Bank premises and equipment, net 18,725 19,297
Land [Member]    
Property Plant And Equipment [Line Items]    
Bank premises and equipment, gross 6,644 6,644
Building and improvements [Member]    
Property Plant And Equipment [Line Items]    
Bank premises and equipment, gross 18,498 18,472
Furniture and equipment [Member]    
Property Plant And Equipment [Line Items]    
Bank premises and equipment, gross $ 8,358 $ 7,972