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Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 13,668,275	$ 14,219,544	$ 11,761,447	$ 11,483,015
Other comprehensive income before reclassifications	1,235,517	(489,001)	3,252,816	2,325,045
Amounts reclassified from accumulated other comprehensive income	(528,098)	(280,985)	(638,569)	(358,502)
Other comprehensive income (loss)	707,419	(769,986)	2,614,247	1,966,543
Ending balance	14,375,694	13,449,558	14,375,694	13,449,558
Unrealized Gains And Losses On Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	13,774,631	14,331,320	11,870,647	11,597,741
Other comprehensive income before reclassifications	1,235,517	(489,001)	3,252,816	2,325,045
Amounts reclassified from accumulated other comprehensive income	(529,519)	(282,461)	(642,834)	(362,928)
Other comprehensive income (loss)	705,998	(771,462)	2,609,982	1,962,117
Ending balance	14,480,629	13,559,858	14,480,629	13,559,858
Postretirement Benefits Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(106,356)	(111,776)	(109,200)	(114,726)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	1,421	1,476	4,265	4,426
Other comprehensive income (loss)	1,421	1,476	4,265	4,426
Ending balance	$ (104,935)	$ (110,300)	$ (104,935)	$ (110,300)

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- Definition

Accumulated Other Comprehensive Income (Loss) [Roll Forward]

+ References

No definition available.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

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-Publisher FASB
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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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