Stockholders' Equity and Earnings per Common Share (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Available-for-sale securities [Abstract]
Realized gains on sales of securities	$ 0	$ (314,395)
Unrealized Gains (Losses) on Securities [Abstract]
Balance at beginning of the period	1,993,000
Net change for the year	(1,726,547)	(754,624)
Balance at end of the period	266,000
Defined Benefit Pension Plans [Abstract]
Balance at beginning of the period	(2,184,000)
Net change for the year	0
Balance at end of the period	(2,184,000)
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at beginning of the period	(191,463)
Net change for the year	(1,726,547)	(754,624)
Balance at end of the period	(1,918,010)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	154
Gain on sale of available-for-sale securities, net [Member]
Available-for-sale securities [Abstract]
Realized gains on sales of securities	0	314,395
Income tax expense [Member]
Available-for-sale securities [Abstract]
Tax effect	0	(107,000)
Net of tax [Member]
Available-for-sale securities [Abstract]
Available-for-sale Securities	$ 0	$ 207,000