Consolidated Statements of Changes in Stockholders' Equity (unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Unrealized holding (losses) gains arising during period, taxes	$ 221	$ 61
Realized net gains		45
Accretion of net unrealized losses transferred during the period, taxes	690	935
Pension liability adjustment, taxes	$ 311	$ 322
Class A Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	3,000
Cash dividends, per share	$ 0.24	$ 0.24
Class B Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	3,000
Cash dividends, per share	$ 0.12	$ 0.12