Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Repurchased of common stock shares			$ 3,305
Common stock issued in public stock offering, Shares		6,325
Retained Earnings [Member]
Cash dividends declared, per common share	$ 0.96	$ 0.96	$ 0.96