Regulatory Matters (Narrative) (Details)	9 Months Ended
	Sep. 30, 2018
Regulatory Matters [Abstract]
Percentage of net profits from preceding period for which dividend is paid to surplus fund (in hundredths)	50.00%
Percentage of capital stock (in hundredths)	50.00%
Percentage of net profits from preceding period for which dividend is paid to surplus fund thereafter (in hundredths)	25.00%
Percentage of capital stock thereafter (in hundredths)	100.00%