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Nature of Banking Activities and Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Estimated useful lives of property and equipment
Depreciation of property and equipment is computed principally on the straight-line method over the following estimated useful lives:
 
Years
Buildings and improvements
10-40
Furniture and equipment
3-15