Schedule II - Condensed Statement of Income (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Investment income – interest and dividends	$ 4,259,501	$ 3,894,608	$ 3,980,411
Net realized gain (loss) on investments	268,294	195,800	1,066,239
Other	8,627,935	8,274,823	7,701,340
Total Revenues	123,119,286	126,251,497	115,079,092
Salaries, employee benefits and payroll taxes	25,218,225	25,386,511	21,881,540
Office occupancy and operations	5,049,962	4,430,220	3,994,244
Business development	2,333,491	2,145,639	1,856,848
Professional and contract labor fees	2,676,483	2,171,606	2,420,387
Other expenses	820,882	755,407	615,053
Income before Income Taxes	13,488,498	21,542,738	16,079,907
(Benefit) Provision for Income Taxes	3,816,000	6,746,000	4,889,000
Net Income	9,672,498	14,796,738	11,190,907
Net Income Attributable to Redeemable Noncontrolling Interest	(23,523)	(88,528)	(88,411)
Net Income Attributable to the Company	9,648,975	14,708,210	11,102,496
Basic Earnings per Common Share	$ 4.75	$ 7.15	$ 5.33
Weighted Average Shares Outstanding – Basic	2,031,760	2,056,169	2,081,703
Diluted Earnings per Common Share	$ 4.74	$ 7.08	$ 5.24
Weighted Average Shares Outstanding – Diluted	2,037,534	2,076,628	2,116,793
Common Stock, Dividends, Per Share, Declared	$ 0.32	$ 0.32	$ 0.29
Parent Company
Condensed Financial Statements, Captions [Line Items]
Investment income – interest and dividends	482,711	348,933	520,511
Net realized gain (loss) on investments	9,169	(50,778)	616,001
Rental income	772,256	748,764	736,159
Other	59,569	68,966	(62,253)
Total Revenues	1,323,705	1,115,885	1,810,418
Salaries, employee benefits and payroll taxes	673,729	576,429	459,248
Office occupancy and operations	270,881	408,373	390,227
Business development	49,059	45,022	25,909
Taxes – other than payroll and income	200,718	188,314	240,607
Professional and contract labor fees	192,064	351,093	245,398
Other expenses	193,681	177,810	161,937
Total operating expenses	1,580,132	1,747,041	1,523,326
Equity in Net Income of Affiliated Companies	9,777,925	15,164,894	10,992,815
Income before Income Taxes	9,521,498	14,533,738	11,279,907
(Benefit) Provision for Income Taxes	(151,000)	(263,000)	89,000
Net Income	9,672,498	14,796,738	11,190,907
Net Income Attributable to Redeemable Noncontrolling Interest	(23,523)	(88,528)	(88,411)
Net Income Attributable to the Company	$ 9,648,975	$ 14,708,210	$ 11,102,496
Basic Earnings per Common Share	$ 4.75	$ 7.15	$ 5.33
Weighted Average Shares Outstanding – Basic	2,031,760	2,056,169	2,081,703
Diluted Earnings per Common Share	$ 4.74	$ 7.08	$ 5.24
Weighted Average Shares Outstanding – Diluted	2,037,534	2,076,628	2,116,793
Common Stock, Dividends, Per Share, Declared	$ 0.32	$ 0.32	$ 0.29