Loans (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unpaid Principal	$ 3,410	$ 5,474
Recorded Investment	3,410	5,474	8,773
Related allowance	2,434	3,178	1,496
Recorded Investment	9,029	11,745	2,643
Recorded Investment	12,439	17,219	11,416
Average Recorded Investment	12,026	12,965	10,122
Interest income recognized	569	597	421
Commercial and Industrial
Unpaid Principal	1,483	1,606
Recorded Investment	1,483	1,606
Average Recorded Investment	1,545	2,409
Interest income recognized	88	51
Unpaid Principal	3,626	4,850
Related allowance	1,287	1,635
Recorded Investment	2,339	3,215
Average Recorded Investment	2,777	2,050
Interest income recognized	62	93
Unpaid Principal	5,109	6,456
Related allowance	1,287	1,635
Recorded Investment	3,822	4,821
Average Recorded Investment	4,322	4,459
Interest income recognized	150	144
Commercial Real Estate
Unpaid Principal	1,103	3,706
Recorded Investment	1,103	3,706
Average Recorded Investment	2,405	4,515
Interest income recognized	194	204
Unpaid Principal	2,899	3,706
Related allowance	643	694
Recorded Investment	2,256	3,012
Average Recorded Investment	2,634	1,637
Interest income recognized	105	154
Unpaid Principal	4,002	7,412
Related allowance	643	694
Recorded Investment	3,359	6,718
Average Recorded Investment	5,039	6,152
Interest income recognized	299	358
Commercial Construction and Development
Unpaid Principal
Recorded Investment
Average Recorded Investment		120
Interest income recognized	33
Unpaid Principal	202	651
Related allowance	31	191
Recorded Investment	171	460
Average Recorded Investment	316	386
Interest income recognized	21	23
Unpaid Principal	202	651
Related allowance	31	191
Recorded Investment	171	460
Average Recorded Investment	316	506
Interest income recognized	54	23
Agricultural
Unpaid Principal
Recorded Investment
Average Recorded Investment		150
Interest income recognized
Unpaid Principal	154	28
Related allowance	40	28
Recorded Investment	114	0
Average Recorded Investment	57	5
Interest income recognized	10	2
Unpaid Principal	154	28
Related allowance	40	28
Recorded Investment	114	0
Average Recorded Investment	57	155
Interest income recognized	10	2
Residential Prime
Unpaid Principal	824	162
Recorded Investment	824	162
Average Recorded Investment	493	396
Interest income recognized	9	1
Unpaid Principal	1,463	2,029
Related allowance	277	448
Recorded Investment	1,186	1,581
Average Recorded Investment	1,384	1,041
Interest income recognized	22	53
Unpaid Principal	2,287	2,191
Related allowance	277	448
Recorded Investment	2,010	1,743
Average Recorded Investment	1,877	1,437
Interest income recognized	31	54
Residential Heloc
Unpaid Principal
Recorded Investment
Average Recorded Investment		23
Interest income recognized	3
Unpaid Principal	506	268
Related allowance	126	131
Recorded Investment	380	137
Average Recorded Investment	259	99
Interest income recognized	15	9
Unpaid Principal	506	268
Related allowance	126	131
Recorded Investment	380	137
Average Recorded Investment	259	122
Interest income recognized	18	9
Residential construction and development
Unpaid Principal
Recorded Investment
Average Recorded Investment		12
Interest income recognized
Unpaid Principal	153	144
Related allowance	4	36
Recorded Investment	149	108
Average Recorded Investment	129	74
Interest income recognized	5	5
Unpaid Principal	153	144
Related allowance	4	36
Recorded Investment	149	108
Average Recorded Investment	129	86
Interest income recognized	5	5
Consumer
Unpaid Principal
Recorded Investment
Average Recorded Investment		11
Interest income recognized
Unpaid Principal	26	69
Related allowance	26	15
Recorded Investment		54
Average Recorded Investment	27	37
Interest income recognized	2	2
Unpaid Principal	26	69
Related allowance	26	15
Recorded Investment		54
Average Recorded Investment	27	48
Interest income recognized	$ 2	$ 2