Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Common stock, dividends, per share, cash paid (in dollars per share)	$ 0.31	$ 0.27	$ 0.23
Cumulative effect adjustment				$ 0
Retained earnings
Cumulative effect adjustment				75
Accounting Standards Update 2016-09 | Retained earnings
Cumulative effect adjustment	$ 498
Accounting Standards Update 2016-01
Cumulative effect adjustment	40			0
Accounting Standards Update 2016-01 | Retained earnings
Cumulative effect adjustment				$ (40)
Accounting Standards Update 2018-02
Cumulative effect adjustment	$ 75