Loans (Details 4) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Nonperforming loans by class
Nonaccrual loans - held-for-sale	$ 177,000	$ 186,000	$ 202,000
Nonaccrual loans - held-for-investment	12,890,000	14,353,000	21,607,000
Restructured and Loans Over 90 Days Past Due and Still Accruing	1,665,000	2,291,000	1,073,000
Total	14,732,000	16,830,000	22,882,000
Other restructured loans	416,000	1,270,000	1,375,000
Impaired loans, excluding loans held-for-sale	14,971,000	17,914,000	24,055,000
Nonaccrual	13,067,000	14,539,000
Aging of past due loans by class of loans
30-59 Days Past Due	5,354,000	5,045,000
60-89 Days Past Due	4,163,000	508,000
90 Days or Greater Past Due	2,290,000	4,958,000
Total Past Due	11,807,000	10,511,000
Loans Not Past Due	786,160,000	753,757,000
Total ending loan balance	797,967,000	764,268,000
30 days or greater past due nonaccrual loans	5,353,000	6,312,000
Less than 30 days past due nonaccrual loans held-for-investment	7,537,000	8,041,000
Commercial
Nonperforming loans by class
Restructured and Loans Over 90 Days Past Due and Still Accruing	1,665,000	1,803,000
Total	10,705,000	10,679,000
Nonaccrual	9,040,000	8,876,000
Aging of past due loans by class of loans
30-59 Days Past Due	1,718,000	1,999,000
60-89 Days Past Due	2,794,000	508,000
90 Days or Greater Past Due	2,189,000	3,394,000
Total Past Due	6,701,000	5,901,000
Loans Not Past Due	377,559,000	360,689,000
Total ending loan balance	384,260,000	366,590,000
Real estate
Aging of past due loans by class of loans
Total ending loan balance	400,683,000	386,512,000
Real estate | Commercial and residential
Nonperforming loans by class
Total	1,104,000	2,137,000
Nonaccrual	1,104,000	2,137,000
Aging of past due loans by class of loans
30-59 Days Past Due	1,164,000	2,293,000
60-89 Days Past Due	1,369,000
90 Days or Greater Past Due	101,000
Total Past Due	2,634,000	2,293,000
Loans Not Past Due	330,414,000	309,186,000
Total ending loan balance	333,048,000	311,479,000
Real estate | Land and construction
Nonperforming loans by class
Restructured and Loans Over 90 Days Past Due and Still Accruing		456,000
Total	2,365,000	3,970,000
Nonaccrual	2,365,000	3,514,000
Aging of past due loans by class of loans
30-59 Days Past Due	2,472,000
90 Days or Greater Past Due		1,532,000
Total Past Due	2,472,000	1,532,000
Loans Not Past Due	17,350,000	21,484,000
Total ending loan balance	19,822,000	23,016,000
Real estate | Home equity
Nonperforming loans by class
Restructured and Loans Over 90 Days Past Due and Still Accruing		32,000
Total	398,000	32,000
Nonaccrual	398,000
Aging of past due loans by class of loans
30-59 Days Past Due		753,000
90 Days or Greater Past Due		32,000
Total Past Due		785,000
Loans Not Past Due	47,813,000	51,232,000
Total ending loan balance	47,813,000	52,017,000
Consumer
Nonperforming loans by class
Total	160,000	12,000
Nonaccrual	160,000	12,000
Aging of past due loans by class of loans
Loans Not Past Due	13,024,000	11,166,000
Total ending loan balance	$ 13,024,000	$ 11,166,000