Investments (Details 1) (USD $)
Jun. 30, 2012
Available for sale securities:  
Available for sale securities, Due in one year or less, Amortized Cost $ 15,777,229
Available for sale securities, Due after one year through five years, Amortized Cost 75,682,518
Available for sale securities, Due after five year through ten years, Amortized Cost 117,542,039
Available for sale securities, Due after ten years, Amortized Cost 93,236,587
Available for sale securities, Mortgage-backed securities, Amortized Cost 19,168,371
Totals, Amortized Cost 321,406,744
Available for sale securities, Due in one year or less, Fair Value 15,783,341
Available for sale securities, Due after one year through five years, Fair Value 76,496,170
Available for sale securities, Due after five years through ten years, Fair Value 120,432,646
Available for sale securities, Due after ten years, Fair Value 94,133,290
Available for sale securities, Mortgage-backed securities, Fair value 19,518,160
Totals, Fair Value 326,363,607
Held to maturity securities:  
Held to maturity securities, Due in one year or less, Amortized Cost 169,813
Held to maturity securities, Due after one year through five years, Amortized Cost 1,545,816
Held to maturity securities, Due after five years through ten years, Amortized Cost 1,206,445
Held to maturity securities, Due after ten years, Amortized Cost 2,061,849
Totals, Amortized Cost 4,983,923
Held to maturity securities, Due in one year or less, Fair Value 172,603
Held to maturity securities, Due after one year through five years, Fair Value 1,595,798
Held to maturity securities, Due after five years through ten years, Fair Value 1,221,271
Held to maturity securities, Due after ten years, Fair Value 2,086,145
Totals, Fair Value $ 5,075,817