Loans (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Recorded investment
Loans with no related allowance recorded	$ 11,927,000	$ 14,087,000
Loans with an allowance recorded	10,580,000	15,242,000
Total	22,507,000	29,329,000
Unpaid principal balance
Loans with no related allowance recorded	16,126,000	17,555,000
Loans with an allowance recorded	10,898,000	19,186,000
Total	27,024,000	36,741,000
Related allowance	1,452,000	3,617,000
Average recorded investment
Loans with no related allowance recorded	13,387,000	13,742,000
Loans with an allowance recorded	14,956,000	15,369,000
Total	28,343,000	29,111,000
Additional disclosure
Interest income on impaired or non-accrual loans (cash basis)	185,000	157,000	391,000
Interest income that would have been recorded if non-accrual loans were on a current basis	1,248,000	1,167,000	1,104,000
Loans past due more than 90 days or more and still accruing interest	437,000	719,000
Recorded investment in non-accrual loans	15,258,000	18,360,000
Commercial and industrial
Recorded investment
Loans with no related allowance recorded	830,000	6,735,000
Loans with an allowance recorded	6,749,000	1,932,000
Total	7,579,000	8,667,000
Unpaid principal balance
Loans with no related allowance recorded	974,000	7,591,000
Loans with an allowance recorded	6,749,000	5,103,000
Total	7,723,000	12,694,000
Related allowance	762,000	156,000
Average recorded investment
Loans with no related allowance recorded	4,499,000	6,226,000
Loans with an allowance recorded	3,806,000	3,294,000
Total	8,305,000	9,520,000
Additional disclosure
Loans past due more than 90 days or more and still accruing interest	421,000
Recorded investment in non-accrual loans	846,000	1,554,000
Construction and development excluding undeveloped land
Recorded investment
Loans with no related allowance recorded	26,000	118,000
Loans with an allowance recorded		433,000
Total	26,000	551,000
Unpaid principal balance
Loans with no related allowance recorded	151,000	381,000
Loans with an allowance recorded		433,000
Total	151,000	814,000
Average recorded investment
Loans with no related allowance recorded	54,000	158,000
Loans with an allowance recorded	259,000	260,000
Total	313,000	418,000
Additional disclosure
Recorded investment in non-accrual loans	26,000	551,000
Undeveloped land
Recorded investment
Loans with no related allowance recorded	7,340,000	234,000
Loans with an allowance recorded		10,078,000
Total	7,340,000	10,312,000
Unpaid principal balance
Loans with no related allowance recorded	9,932,000	1,806,000
Loans with an allowance recorded		10,702,000
Total	9,932,000	12,508,000
Related allowance		2,898,000
Average recorded investment
Loans with no related allowance recorded	3,272,000	886,000
Loans with an allowance recorded	7,152,000	7,232,000
Total	10,424,000	8,118,000
Additional disclosure
Recorded investment in non-accrual loans	7,340,000	10,312,000
Real estate mortgage
Recorded investment
Loans with no related allowance recorded	3,731,000	6,996,000
Loans with an allowance recorded	3,747,000	2,799,000
Total	7,478,000	9,795,000
Unpaid principal balance
Loans with no related allowance recorded	5,069,000	7,752,000
Loans with an allowance recorded	4,065,000	2,948,000
Total	9,134,000	10,700,000
Related allowance	606,000	563,000
Average recorded investment
Loans with no related allowance recorded	5,559,000	6,451,000
Loans with an allowance recorded	3,705,000	4,583,000
Total	9,264,000	11,034,000
Additional disclosure
Loans past due more than 90 days or more and still accruing interest	16,000	485,000
Recorded investment in non-accrual loans	7,046,000	5,939,000
Consumer
Recorded investment
Loans with no related allowance recorded		4,000
Loans with an allowance recorded	84,000
Total	84,000	4,000
Unpaid principal balance
Loans with no related allowance recorded		25,000
Loans with an allowance recorded	84,000
Total	84,000	25,000
Related allowance	84,000
Average recorded investment
Loans with no related allowance recorded	3,000	21,000
Loans with an allowance recorded	34,000
Total	37,000	21,000
Additional disclosure
Loans past due more than 90 days or more and still accruing interest		234,000
Recorded investment in non-accrual loans		$ 4,000