Consolidated Statements of Changes in Stockholders' Equity [Parenthetical] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Exercise of stock options (in shares)	0	3,750
Issuance of common stock (in shares)		350,000
Issuance of common stock for restricted stock awards (in shares)	7,550	10,400
Cash dividends declared on common stock (in dollars per share)	$ 1.04	$ 0.96