Stockholders' Equity and Earnings per Common Share, Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Available-for-sale securities [Abstract]
Gain (loss) on sale of available-for-sale securities, net		$ 522	$ 76
Reclassification adjustment for gains (losses) recognized in income, tax effect		177	26
Total		345	50
Defined-benefit pension plan [Abstract]
Salaries and employee benefits		(504)	(390)
Income tax benefit		(171)	(133)
Total		(333)	(257)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Available-for-sale securities [Abstract]
Gain (loss) on sale of available-for-sale securities, net		522	76
Reclassification adjustment for gains (losses) recognized in income, tax effect		177	26
Total		345	50
Defined-benefit pension plan [Abstract]
Salaries and employee benefits	[1]	(504)	(390)
Income tax benefit		(171)	(133)
Total		(333)	(257)
Total reclassification for the period		$ 12	$ (207)

[1] This accumulated other comprehensive loss component is included in the computation of net periodic pension cost (see NOTE 14, Pension Plan for additional details).