Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity
Other comprehensive income (loss), tax	$ (254)	$ (507)	$ 179
Cash dividends (in dollars per share)	$ 0.50	$ 0.485	$ 0.48
Issuance of common stock - unvested shares (in shares)	7,889	7,956	7,333
Issuance of common stock - vested shares (in shares)	4,293	4,149	4,194
Repurchase of common stock (in shares)		960	368
Forfeiture of common stock - unvested shares (in Shares)		1,210
Issuance of common stock - performance-based restricted stock units (in shares)	4,662
Repurchase of common stock - unvested shares (in Shares)	2,007