Allowance for Loan Losses, evaluated for impairment (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Ending allowance balance [Abstract]
Individually evaluated for impairment	$ 4,493		$ 4,882
Collectively evaluated for impairment	8,437		11,028
Total ending allowance balance	12,930	12,737	15,910	15,650
Ending loan balance [Abstract]
Individually evaluated for impairment	45,621		69,494
Collectively evaluated for impairment	691,199		637,019
Total Loans	736,820	747,050	706,513
Commercial [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	456		304
Collectively evaluated for impairment	551		776
Total ending allowance balance	1,007	981	1,080	1,071
Ending loan balance [Abstract]
Individually evaluated for impairment	1,554		1,885
Collectively evaluated for impairment	51,352		53,788
Total Loans	52,906		55,673
Agricultural [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	300		297
Total ending allowance balance	300	296	297	297
Ending loan balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	7,856		8,848
Total Loans	7,856	6,211	8,848
Commercial Construction [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	1,493		2,755
Collectively evaluated for impairment	296		418
Total ending allowance balance	1,789	1,890	3,173	3,123
Ending loan balance [Abstract]
Individually evaluated for impairment	9,442		23,322
Collectively evaluated for impairment	42,652		33,098
Total Loans	52,094	53,808	56,420
Residential Construction [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	138		138
Total ending allowance balance	138	138	138	138
Ending loan balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	7,570		3,224
Total Loans	7,570	5,852	3,224
Commercial Real Estate [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	1,426		1,023
Collectively evaluated for impairment	3,888		5,577
Total ending allowance balance	5,314	5,163	6,600	6,448
Ending loan balance [Abstract]
Individually evaluated for impairment	25,175		35,665
Collectively evaluated for impairment	303,677		264,724
Total Loans	328,852	334,386	300,389
Residential [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	1,118		788
Collectively evaluated for impairment	2,334		2,923
Total ending allowance balance	3,452	3,406	3,711	3,695
Ending loan balance [Abstract]
Individually evaluated for impairment	7,173		6,086
Collectively evaluated for impairment	197,485		188,782
Total Loans	204,658		194,868
Farmland [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	0		12
Collectively evaluated for impairment	302		357
Total ending allowance balance	302	291	369	365
Ending loan balance [Abstract]
Individually evaluated for impairment	2,277		2,536
Collectively evaluated for impairment	45,931		45,472
Total Loans	48,208	49,057	48,008
Consumer [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	282		232
Total ending allowance balance	282	228	232	205
Ending loan balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	28,379		29,643
Total Loans	28,379		29,643
Other [Member]
Ending allowance balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	346		310
Total ending allowance balance	346	344	310	308
Ending loan balance [Abstract]
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	6,297		9,440
Total Loans	$ 6,297		$ 9,440