Summary of Significant Accounting Policies - Goodwill and Other Intangibles (Details) (USD $)	3 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Goodwill impairment	$ 4,900,000	$ 0	$ 4,943,872	$ 0
Finite-Lived Intangible Assets [Line Items]
Carrying Amount		13,402,000	13,402,000
Accumulated Amortization		(10,567,000)	(9,309,000)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Remaining weighted average amortization period		6 years 6 months
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Useful life		20 years
Carrying Amount		12,522,000	12,522,000
Accumulated Amortization		(9,869,000)	(8,789,000)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2013		677,872
2014		590,409
2015		502,946
2016		415,481
2017		250,344
Thereafter		216,392
Noncompete Agreements
Finite-Lived Intangible Assets [Line Items]
Useful life		5 years
Carrying Amount		880,000	880,000
Accumulated Amortization		(698,000)	(520,000)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2013		139,980
2014		$ 41,660