Loans (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing receivable credit quality indicators
Total Financing Receivables	$ 1,202,478	$ 1,208,074
Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,052,609	1,036,050
Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	38,104	65,633
Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	23,136	6,254
Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	44,450	28,526
Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	44,179	71,611
Construction and Land Development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	56,213	49,184
Construction and Land Development [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	49,940	42,899
Construction and Land Development [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,748	802
Construction and Land Development [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	90
Construction and Land Development [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Construction and Land Development [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,790	2,227
Construction and Land Development [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	2,735	3,166
Commercial Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	473,803	508,353
Commercial Real Estate [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	372,370	387,161
Commercial Real Estate [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	34,003	57,334
Commercial Real Estate [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	22,597	5,558
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	23,416	13,120
Commercial Real Estate [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	21,417	45,180
Residential Real Estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	562,421	546,246
Residential Real Estate [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	523,006	505,316
Residential Real Estate [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,125	5,529
Residential Real Estate [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	9	133
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	18,654	12,555
Residential Real Estate [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	19,627	22,713
Commercial and Financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	58,222	53,105
Commercial and Financial [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	57,093	51,375
Commercial and Financial [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	836	1,445
Commercial and Financial [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	256	168
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	37	16
Commercial and Financial [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	101
Consumer [Member]
Financing receivable credit quality indicators
Total Financing Receivables	51,564	50,611
Consumer [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	50,200	49,299
Consumer [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	392	523
Consumer [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	274	305
Consumer [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Consumer [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	553	608
Consumer [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	$ 400	$ 451