Loans (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing receivable credit quality indicators
Total Financing Receivables	$ 1,223,810	$ 1,226,081
Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,108,657	1,103,938
Special mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	17,702	16,577
Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	21,073	22,665
Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	35,208	40,955
Pass-Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	8,539	8,616
Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	32,631	33,330
Construction & Land Development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	59,626	60,736
Construction & Land Development [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	54,382	54,994
Construction & Land Development [Member] | Special mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,683	1,717
Construction & Land Development [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Construction & Land Development [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Construction & Land Development [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,035	1,342
Construction & Land Development [Member] | Pass-Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,938	2,103
Construction & Land Development [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	588	580
Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	481,468	486,828
Commercial Real Estate [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	413,565	414,023
Commercial Real Estate [Member] | Special mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	13,304	12,137
Commercial Real Estate [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	20,691	22,180
Commercial Real Estate [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Commercial Real Estate [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	12,689	17,234
Commercial Real Estate [Member] | Pass-Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	6,601	6,513
Commercial Real Estate [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	14,618	14,741
Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	574,523	569,331
Residential Real Estate [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	534,720	527,891
Residential Real Estate [Member] | Special mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,620	1,686
Residential Real Estate [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	47	36
Residential Real Estate [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Residential Real Estate [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	21,180	22,099
Residential Real Estate [Member] | Pass-Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Residential Real Estate [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	16,956	17,619
Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	64,752	61,903
Commercial and Financial [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	64,125	61,123
Commercial and Financial [Member] | Special mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	545	587
Commercial and Financial [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	82	193
Commercial and Financial [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Commercial and Financial [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Commercial and Financial [Member] | Pass-Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Commercial and Financial [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Consumer Loans [Member]
Financing receivable credit quality indicators
Total Financing Receivables	43,441	47,283
Consumer Loans [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	41,865	45,907
Consumer Loans [Member] | Special mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	550	450
Consumer Loans [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	253	256
Consumer Loans [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Consumer Loans [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	304	280
Consumer Loans [Member] | Pass-Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Consumer Loans [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	$ 469	$ 390