Loans (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing receivable credit quality indicators
Total Financing Receivables	$ 1,265,893	$ 1,226,081
Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	61,116	60,736
Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	513,598	486,828
Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	581,378	569,331
Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	65,224	61,903
Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	44,577	47,283
Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,169,221	1,103,938
Pass [Member] | Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	56,037	54,994
Pass [Member] | Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	464,031	414,023
Pass [Member] | Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	542,189	527,891
Pass [Member] | Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	63,854	61,123
Pass [Member] | Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	43,110	45,907
Special mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	21,814	16,577
Special mention [Member] | Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,231	1,717
Special mention [Member] | Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	18,337	12,137
Special mention [Member] | Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	699	1,686
Special mention [Member] | Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,297	587
Special mention [Member] | Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	250	450
Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	11,980	22,665
Substandard [Member] | Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Substandard [Member] | Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	10,075	22,180
Substandard [Member] | Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,327	36
Substandard [Member] | Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	73	193
Substandard [Member] | Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	505	256
Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Doubtful [Member] | Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Doubtful [Member] | Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Doubtful [Member] | Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Doubtful [Member] | Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Doubtful [Member] | Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	33,266	40,955
Nonaccrual [Member] | Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,533	1,342
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	10,926	17,234
Nonaccrual [Member] | Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	20,552	22,099
Nonaccrual [Member] | Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Nonaccrual [Member] | Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	255	280
Pass-Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	9,253	8,616
Pass-Troubled debt restructures [Member] | Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,838	2,103
Pass-Troubled debt restructures [Member] | Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	7,415	6,513
Pass-Troubled debt restructures [Member] | Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Pass-Troubled debt restructures [Member] | Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Pass-Troubled debt restructures [Member] | Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	20,359	33,330
Troubled debt restructures [Member] | Construction & land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	477	580
Troubled debt restructures [Member] | Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	2,814	14,741
Troubled debt restructures [Member] | Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	16,611	17,619
Troubled debt restructures [Member] | Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Troubled debt restructures [Member] | Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	$ 457	$ 390