Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Stock options exercised (in shares)	35,310	4,950
Vesting of restricted stock (in shares)	10,718	7,086
Equity-based compensation (in shares)	28,574	24,344
Cash dividends paid (in dollars per share)	$ 0.75	$ 0.72