Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash dividend declared per share	$ 0.50	$ 0.49	$ 0.39
Retained Earnings
Cash dividend declared per share	$ 0.50	$ 0.49	$ 0.39
Treasury Stock
Treasury shares purchased shares	59,352	82,637	13,463
Treasury shares reissued shares	2,770	2,770	2,770
Additional Paid-in Capital
Treasury shares reissued shares	2,770	2,770	2,770