Summary of Significant Accounting Policies (Premises, Furniture and Equipment, net) (Details)	12 Months Ended
	Dec. 31, 2018
Building | Minimum
Property, Plant and Equipment [Line Items]
Useful life	18 years
Building | Maximum
Property, Plant and Equipment [Line Items]
Useful life	39 years
Land Improvements
Property, Plant and Equipment [Line Items]
Useful life	15 years
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	7 years