Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Unrealized holding gains arising during period, taxes	$ 92	$ 91	$ 75	$ 100
Realized net gains	7			197
Accretion of net unrealized losses transferred during the period, taxes	73	90	151	229
Pension liability adjustment, taxes	$ 103	$ 114	$ 206	$ 228
Class A Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	12,120		12,120	2,200
Cash dividends, per share	$ 0.12	$ 0.12	$ 0.24	$ 0.24
Class B Common Stock [Member]
Conversion of Class B Common Stock to Class A Common Stock, shares	12,120		12,120	2,200
Cash dividends, per share	$ 0.06	$ 0.06	$ 0.12	$ 0.12