Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	9	57
Pre Modification Outstanding Recorded Investment	$ 12,409,000	$ 23,416,000
Post Modification Outstanding Recorded Investment net of related allowance	10,771,000	19,810,000
Troubled debt restructurings subsequently defaulted		0
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	382,238,000
Financing receivables unfunded commitment	57,999,000
Financing receivables exposure	440,237,000	509,003,000
Lessors of Residential Buildings [Member]
Loan portfolio credit risk exposure [Abstract]
Financing receivables principal balance	191,693,000
Financing receivables unfunded commitment	24,206,000
Financing receivables exposure	215,899,000	177,414,000
Land Subdividers [Member]
Loan portfolio credit risk exposure [Abstract]
Financing receivables principal balance	92,613,000
Financing receivables unfunded commitment	15,670,000
Financing receivables exposure	108,283,000	119,106,000
Commercial and Industrial [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	0	26
Pre Modification Outstanding Recorded Investment	0	1,845,000
Post Modification Outstanding Recorded Investment net of related allowance	0	1,563,000
Number of Contracts of troubled debt restructurings subsequently defaulted	8
Troubled debt restructurings subsequently defaulted	476,000
Construction and Land Development [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	0	2
Pre Modification Outstanding Recorded Investment	0	77,000
Post Modification Outstanding Recorded Investment net of related allowance	0	65,000
Consumer Real Estate - Mortgage [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	4	16
Pre Modification Outstanding Recorded Investment	834,000	5,874,000
Post Modification Outstanding Recorded Investment net of related allowance	718,000	5,358,000
Commercial Real Estate Other [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of Contracts of troubled debt restructurings subsequently defaulted	2
Troubled debt restructurings subsequently defaulted	3.2
Commercial Real Estate - Mortgage [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	4	9
Pre Modification Outstanding Recorded Investment	11,539,000	15,378,000
Post Modification Outstanding Recorded Investment net of related allowance	10,022,000	12,619,000
Consumer and Other [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts	1	4
Pre Modification Outstanding Recorded Investment	36,000	242,000
Post Modification Outstanding Recorded Investment net of related allowance	31,000	205,000
Number of Contracts of troubled debt restructurings subsequently defaulted	2
Troubled debt restructurings subsequently defaulted	$ 153,000