Stockholders' Equity and Earnings per Common Share, Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 93,176	$ 88,497
Ending Balance		93,990	93,176
Other comprehensive income, pretax [Abstract]
Unrealized holding gains (losses) arising during the period, pretax		(1,240)	(679)
Reclassification adjustment for gains (loss) recognized in income, pretax		(522)	(76)
Net unrealized losses on securities, pretax		(1,762)	(755)
Elimination upon transfer back to available-for-sale, pretax		0	4,197
Amortization, pretax		0	934
Net change, pretax		0	5,131
Net actuarial income (loss) for the period, pretax		(327)	(627)
Amortization of actuarial gain (loss) from prior period, pretax		504	390
Net change, pretax		177	(237)
Total change in accumulated other comprehensive income or (loss), pretax		(1,585)	4,139
Other Comprehensive Income Tax Effect [Abstract]
Unrealized holding gains (losses) arising during the period, tax effect		(422)	(231)
Reclassification adjustment for gains (losses) recognized in income, tax effect		(177)	(26)
Net unrealized losses on securities, tax effect		(599)	(257)
Elimination upon transfer back to available-for-sale, tax effect		0	1,427
Amortization, tax effect		0	318
Net change, tax effect		0	1,745
Net actuarial loss for the period, tax effect		(111)	(213)
Amortization of actuarial gain (loss) from prior period, tax effect		171	133
Net change, tax effect		60	(80)
Total change in other comprehensive income or (loss), tax effect		(539)	1,408
Other Comprehensive Income, Net of Tax [Abstract]
Unrealized holding gains (losses) arising during the period, net of tax		(818)	(448)
Reclassification adjustment for gains (losses) recognized in income, net of tax		(345)	(50)
Net unrealized losses on securities, net of tax		(1,163)	(498)
Elimination upon transfer back to available-for-sale, net of tax		0	2,770
Amortization, net of tax		0	616
Net change, net of tax		0	3,386
Net actuarial loss for the period, net of tax		(216)	(414)
Amortization of actuarial gain (loss) from prior period, net of tax		333	257
Net change, net of tax		117	(157)
Total change in other comprehensive income or (loss), net of tax		(1,046)	2,731
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(576)	(78)
Net change for the year		(1,163)	(498)
Ending Balance		(1,739)	(576)
Unrealized Losses on Securities Transferred from Available-for-Sale to Held-to-Maturity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	0	(3,386)
Net change for the year	[1]	0	3,386
Ending Balance	[1]	0	0
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(2,586)	(2,429)
Net change for the year		117	(157)
Ending Balance		(2,469)	(2,586)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(3,162)	(5,893)
Net change for the year		(1,046)	2,731
Ending Balance		(4,208)	(3,162)
Other Comprehensive Income, Net of Tax [Abstract]
Total change in other comprehensive income or (loss), net of tax		$ (1,046)	$ 2,731

[1] Net change for the year ended December 31, 2015 represents reclassification due to the transfer of securities held-to-maturity to available-for-sale. See Note 3. Securities.