Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details) (USD $)	Mar. 31, 2013 Contract	Dec. 31, 2012 Contract	Mar. 31, 2012 Contract
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	2	2
Pre Modification Outstanding Recorded Investment	$ 632,000	$ 382,000
Post Modification Outstanding Recorded Investment, net of related allowance	529,000	320,000
Percentage of credit exposure to risk based capital (in hundredths)	25.00%
Lessors of Nonresidential Buildings [Member]
Loan portfolio credit risk exposure [Abstract]
Financing receivables principal balance	419,148,000
Financing receivables unfunded commitment	46,935,000
Financing receivables exposure	466,083,000	440,237,000
Lessors of Residential Buildings [Member]
Loan portfolio credit risk exposure [Abstract]
Financing receivables principal balance	197,042,000
Financing receivables unfunded commitment	27,838,000
Financing receivables exposure	224,880,000	215,899,000
Land Subdividers [Member]
Loan portfolio credit risk exposure [Abstract]
Financing receivables principal balance	87,587,000
Financing receivables unfunded commitment	13,797,000
Financing receivables exposure	101,384,000	108,283,000
Commercial Real Estate Other [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	0	0
Pre Modification Outstanding Recorded Investment	0	0
Post Modification Outstanding Recorded Investment, net of related allowance	0	0
Number of contracts of troubled debt restructurings subsequently defaulted	2
Troubled debt restructurings subsequently defaulted	1,000,000
Consumer Real Estate - Mortgage [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	1	1
Pre Modification Outstanding Recorded Investment	432,000	343,000
Post Modification Outstanding Recorded Investment, net of related allowance	359,000	288,000
Construction and Land Development [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	0	0
Pre Modification Outstanding Recorded Investment	0	0
Post Modification Outstanding Recorded Investment, net of related allowance	0	0
Commercial and Industrial [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	0	1
Pre Modification Outstanding Recorded Investment	0	39,000
Post Modification Outstanding Recorded Investment, net of related allowance	0	32,000
Number of contracts of troubled debt restructurings subsequently defaulted			4
Troubled debt restructurings subsequently defaulted			194,000
Consumer and Other [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	1	0
Pre Modification Outstanding Recorded Investment	200,000	0
Post Modification Outstanding Recorded Investment, net of related allowance	170,000	0
Number of contracts of troubled debt restructurings subsequently defaulted			2
Troubled debt restructurings subsequently defaulted			$ 154,000