Loans, Net, Troubled Debt Restructuring (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Modifications [Line Items]
Total TDR	$ 12,000,000	$ 11,200,000
TDR included in nonaccrual loans	6,900,000
Valuation Allowance related to total TDR	1,000,000	1,700,000
TDR performing as agreed	5,100,000
Loans modified in a TDR by class of loan [Abstract]
Number Of Contracts	15	16
Pre-Modification Outstanding Recorded Investment	5,899,000	8,620,000
Post-Modification Outstanding Recorded Investment	5,252,000	8,656,000
Number of loans for extended terms	3	16
Number of loans for lowering interest	9	14
Number of loans on interest only payments methods	3
Number of loans for which allowance for loan losses measured under general allowance methodology	5	7
Recorded investment as TDR for which allowance for loan losses measured under general allowance methodology	1,700,000	3,900,000
Allowance for loan losses on recorded investment as TDR	341,000	803,000
Recorded investment restructured as TDR included in non accrual loans	3,500,000	5,200,000
Number of loans restructured included in non accrual loans	2	1
TDR subsequently defaulted	783,000	2,100,000
Real Estate Loans Construction [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	69,000
TDR performing as agreed	108,000
Loans modified in a TDR by class of loan [Abstract]
Number Of Contracts	1	0
Pre-Modification Outstanding Recorded Investment	109,000	0
Post-Modification Outstanding Recorded Investment	108,000	0
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	2,200,000
TDR performing as agreed	2,000,000
Loans modified in a TDR by class of loan [Abstract]
Number Of Contracts	11	5
Pre-Modification Outstanding Recorded Investment	3,955,000	726,000
Post-Modification Outstanding Recorded Investment	3,665,000	718,000
Other Real Estate Loans [Member]
Financing Receivable, Modifications [Line Items]
TDR included in nonaccrual loans	4,600,000
TDR performing as agreed	2,700,000
Loans modified in a TDR by class of loan [Abstract]
Number Of Contracts	2	7
Pre-Modification Outstanding Recorded Investment	1,745,000	7,623,000
Post-Modification Outstanding Recorded Investment	1,418,000	7,667,000
Real Estate Loans [Member]
Loans modified in a TDR by class of loan [Abstract]
Number Of Contracts	14	12
Pre-Modification Outstanding Recorded Investment	5,809,000	8,349,000
Post-Modification Outstanding Recorded Investment	5,191,000	8,385,000
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
TDR performing as agreed	220,000
Loans modified in a TDR by class of loan [Abstract]
Number Of Contracts	1	4
Pre-Modification Outstanding Recorded Investment	90,000	271,000
Post-Modification Outstanding Recorded Investment	61,000	271,000
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