Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized gain on investment	$ 261,938		$ 99,790		$ 333,554		$ 357,819
Accretion (amortization) related to prior year service cost	380		(2,349)		1,139		(7,047)
Unrecognized loss	(1,573)		(171)		(4,720)		(511)
Income before Income Taxes	8,276,523		4,717,915		18,897,991		11,282,755
Tax	(2,733,000)		(1,479,000)		(5,944,000)		(3,239,000)
Net Income	5,543,523		3,238,915		12,953,991		8,043,755
Reclassification Out Of Accumulated Other Comprehensive Income
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net Income	171,585		63,552		218,162		223,185
Reclassification Out Of Accumulated Other Comprehensive Income | Unrealized Gains And Losses On Available-For-Sale Securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net realized gain on investment	261,938		99,790		367,624		434,358
Other-than-temporary impairments	0		0		(34,070)		(76,539)
Income before Income Taxes	261,938		99,790		333,554		357,819
Tax	(89,575)		(34,576)		(113,039)		(129,647)
Net Income	172,363		65,214		220,515		228,172
Reclassification Out Of Accumulated Other Comprehensive Income | Postretirement Benefits Plans
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Accretion (amortization) related to prior year service cost	380		(2,349)		1,139		(7,047)
Unrecognized loss	(1,573)		(171)		(4,720)		(511)
Income before Income Taxes	(1,193)	[1]	(2,520)	[1]	(3,581)	[1]	(7,558)	[1]
Tax	415		858		1,228		2,571
Net Income	$ (778)		$ (1,662)		$ (2,353)		$ (4,987)

[1] These accumulated other comprehensive income components are not reclassified to net income in their entirety in the same reporting period. The amounts are presented within salaries, employee benefits and payroll taxes on the Consolidated Statements of Income as amortized. Amortization related to postretirement benefit plans is included in the computation of net periodic pension costs, as discussed in Note 5.