Stockholders' Equity and Earnings per Share, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Stockholders Equity Note [Abstract]
Beginning Balance			$ 96,388	$ 93,990
Ending Balance	$ 99,293	$ 96,908	99,293	96,908
Other comprehensive income, pretax [Abstract]
Unrealized holding gains (losses) arising during the period, pretax	(152)	1,657	(2,368)	2,305
Reclassification adjustment for gains recognized in income, pretax	(40)	(87)	(120)	(87)
Total change in accumulated other comprehensive loss, net, pretax	(192)	1,570	(2,488)	2,218
Other Comprehensive Income, Tax Effect [Abstract]
Unrealized holding gains (losses) arising during the period, tax effect	(32)	564	(497)	784
Reclassification adjustment for gains recognized in income, tax effect	(8)	(30)	(25)	(30)
Total change in accumulated other comprehensive loss, net, tax effect	(40)	534	(522)	754
Other Comprehensive Income, Net of Tax [Abstract]
Unrealized holding gains (losses) arising during the period, net of tax	(120)	1,093	(1,871)	1,521
Reclassification adjustment for gains recognized in income, net of tax	(32)	(57)	(95)	(57)
Other comprehensive income (loss), net of tax	(152)	1,036	(1,966)	1,464
ASU 2018-02 [Member]
Stockholders Equity Note [Abstract]
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI					$ 0
ASU 2016-01 [Member]
Stockholders Equity Note [Abstract]
Reclassification of net unrealized gains on equity securities from AOCI					0
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Stockholders Equity Note [Abstract]
Beginning Balance	(2,737)	(1,311)	(707)	(1,739)
Net other comprehensive income (loss)	(152)	1,036	(1,966)	1,464
Ending Balance	(2,889)	(275)	(2,889)	(275)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | ASU 2018-02 [Member]
Stockholders Equity Note [Abstract]
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI					(139)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | ASU 2016-01 [Member]
Stockholders Equity Note [Abstract]
Reclassification of net unrealized gains on equity securities from AOCI					(77)
Defined Benefit Pension Plans [Member]
Stockholders Equity Note [Abstract]
Beginning Balance	0	(2,469)	0	(2,469)
Net other comprehensive income (loss)	0	0	0	0
Ending Balance	0	(2,469)	0	(2,469)
Defined Benefit Pension Plans [Member] | ASU 2018-02 [Member]
Stockholders Equity Note [Abstract]
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI					0
Defined Benefit Pension Plans [Member] | ASU 2016-01 [Member]
Stockholders Equity Note [Abstract]
Reclassification of net unrealized gains on equity securities from AOCI					0
Accumulated Other Comprehensive Loss [Member]
Stockholders Equity Note [Abstract]
Beginning Balance	(2,737)	(3,780)	(707)	(4,208)
Net other comprehensive income (loss)	(152)	1,036	(1,966)	1,464
Ending Balance	$ (2,889)	$ (2,744)	(2,889)	(2,744)
Other Comprehensive Income, Net of Tax [Abstract]
Other comprehensive income (loss), net of tax			$ (1,966)	$ 1,464
Accumulated Other Comprehensive Loss [Member] | ASU 2018-02 [Member]
Stockholders Equity Note [Abstract]
Reclassification of the income tax effects of the Tax Cuts and Jobs Act from AOCI					(139)
Accumulated Other Comprehensive Loss [Member] | ASU 2016-01 [Member]
Stockholders Equity Note [Abstract]
Reclassification of net unrealized gains on equity securities from AOCI					$ (77)