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Premises And Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Premises And Equipment, Net [Abstract]  
Major Classes Of Premises And Equipment
    2017     2016  
Land and land improvements $ 6,003   $ 6,003  
Buildings and leasehold improvements   52,900     52,005  
Furniture, fixtures, equipment and vehicles   38,716     32,972  
Premises and equipment   97,619     90,980  
Accumulated depreciation and amortization   (52,430 )   (48,582 )
Premises and equipment, net $ 45,189   $ 42,398