Loan Portfolio, Troubled Debt Restructuring (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013 Loan Contract	Sep. 30, 2013 Contract Loan	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Total TDR	$ 15,800,000	$ 15,800,000	$ 12,000,000
TDR included in nonaccrual loans	11,000,000	11,000,000
TDR performing as agreed	4,800,000	4,800,000
Increase in TDR		3,800,000
Increase in TDR percent		31.70%
Valuation Allowance related to total TDR	2,600,000	2,600,000	2,000,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	11	20
Pre-Modification Outstanding Recorded Investment	3,096,000	5,492,000
Post-Modification Outstanding Recorded Investment	2,752,000	5,080,000
Number of loans for extended terms	10
Number of loans for which allowance for loan losses measured under general allowance methodology		10
Recorded investment as TDR for which allowance for loan losses measured under general allowance methodology		3,800,000
Allowance for loan losses on recorded investment as TDR	1,100,000	1,100,000
Recorded investment restructured as TDR included in non accrual loans	712,000	712,000
Number of loans modified as TDRs in the past 12 months subsequently defaulted	1	1
Total real estate loans [Member]
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	10	18
Pre-Modification Outstanding Recorded Investment	3,046,000	4,975,000
Post-Modification Outstanding Recorded Investment	2,703,000	4,565,000
Real Estate Loans Construction [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	651,000	651,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	1	2
Pre-Modification Outstanding Recorded Investment	45,000	557,000
Post-Modification Outstanding Recorded Investment	41,000	514,000
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	5,400,000	5,400,000
TDR performing as agreed	1,100,000	1,100,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	6	11
Pre-Modification Outstanding Recorded Investment	2,300,000	3,549,000
Post-Modification Outstanding Recorded Investment	1,986,000	3,227,000
Other real estate loans [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	4,900,000	4,900,000
TDR performing as agreed	3,100,000	3,100,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	3	5
Pre-Modification Outstanding Recorded Investment	701,000	869,000
Post-Modification Outstanding Recorded Investment	676,000	824,000
Commercial loans [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	80,000	80,000
TDR performing as agreed	642,000	642,000
Loans modified in a TDR by class of loan [Abstract]
Number of Contracts	1	2
Pre-Modification Outstanding Recorded Investment	50,000	517,000
Post-Modification Outstanding Recorded Investment	49,000	515,000
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