Loan Portfolio, Troubled Debt Restructuring (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013 Loan Contract	Jun. 30, 2013 Contract Loan	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Total TDR	$ 14,200,000	$ 14,200,000	$ 12,000,000
TDR included in nonaccrual loans	8,800,000	8,800,000
TDR performing as agreed	5,400,000	5,400,000
Increase in TDR		2,200,000
Increase in TDR percent		18.30%
Valuation Allowance related to total TDR	2,200,000	2,200,000	2,000,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	7	10
Pre-Modification Outstanding Recorded Investment	2,372,000	2,591,000
Post-Modification Outstanding Recorded Investment	2,326,000	2,515,000
Number of loans for extended terms	3
Number of loans for which allowance for loan losses measured under general allowance methodology		7
Recorded investment as TDR for which allowance for loan losses measured under general allowance methodology		1,800,000
Allowance for loan losses on recorded investment as TDR	958,000	958,000
Number of loans restructured included in non accrual loans		7
Recorded investment restructured as TDR included in non accrual loans	1,809,000	1,809,000
Number of loans modified as TDRs in the past 12 months subsequently defaulted	4	4
Total real estate loans [Member]
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	6	9
Pre-Modification Outstanding Recorded Investment	1,906,000	2,125,000
Post-Modification Outstanding Recorded Investment	1,860,000	2,049,000
Real Estate Loans Construction [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	631,000	631,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	1	1
Pre-Modification Outstanding Recorded Investment	512,000	512,000
Post-Modification Outstanding Recorded Investment	473,000	473,000
Real estate loans, Secured by farmland [Member]
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	0	0
Real estate loans, Secured by 1 - 4 family residential [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	3,500,000	3,500,000
TDR performing as agreed	2,000,000	2,000,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	5	6
Pre-Modification Outstanding Recorded Investment	1,394,000	1,445,000
Post-Modification Outstanding Recorded Investment	1,387,000	1,433,000
Other real estate loans [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	4,600,000	4,600,000
TDR performing as agreed	2,700,000	2,700,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	0	2
Pre-Modification Outstanding Recorded Investment	0	168,000
Post-Modification Outstanding Recorded Investment	0	143,000
Commercial loans [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	34,000	34,000
TDR performing as agreed	658,000	658,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	1	1
Pre-Modification Outstanding Recorded Investment	466,000	466,000
Post-Modification Outstanding Recorded Investment	466,000	466,000
Consumer loans [Member]
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	0	0
Pre-Modification Outstanding Recorded Investment	0	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0