Loans (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing receivable credit quality indicators
Total Financing Receivables	$ 1,221,354	$ 1,208,074
Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	1,054,047	1,036,050
Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	40,990	65,633
Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	22,993	6,254
Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	48,482	28,526
Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	54,842	71,611
Construction and land development [Member]
Financing receivable credit quality indicators
Total Financing Receivables	57,228	49,184
Construction and land development [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	50,121	42,899
Construction and land development [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	2,236	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	2,086	2,227
Construction and land development [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	2,785	3,166
Commercial real estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	493,616	508,353
Commercial real estate [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	379,429	387,161
Commercial real estate [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	36,572	57,334
Commercial real estate [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	22,437	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	25,305	13,120
Commercial real estate [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	29,873	45,180
Residential real estate [Member]
Financing receivable credit quality indicators
Total Financing Receivables	563,935	546,246
Residential real estate [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	520,701	505,316
Residential real estate [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	939	5,529
Residential real estate [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	76	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	20,446	12,555
Residential real estate [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	21,773	22,713
Commercial and financial [Member]
Financing receivable credit quality indicators
Total Financing Receivables	56,220	53,105
Commercial and financial [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	55,159	51,375
Commercial and financial [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	823	1,445
Commercial and financial [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	198	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	40	16
Commercial and financial [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	101
Consumer Loan [Member]
Financing receivable credit quality indicators
Total Financing Receivables	50,133	50,611
Consumer Loan [Member] | Pass [Member]
Financing receivable credit quality indicators
Total Financing Receivables	48,637	49,299
Consumer Loan [Member] | Special Mention [Member]
Financing receivable credit quality indicators
Total Financing Receivables	420	523
Consumer Loan [Member] | Substandard [Member]
Financing receivable credit quality indicators
Total Financing Receivables	282	305
Consumer Loan [Member] | Doubtful [Member]
Financing receivable credit quality indicators
Total Financing Receivables	0	0
Consumer Loan [Member] | Nonaccrual [Member]
Financing receivable credit quality indicators
Total Financing Receivables	605	608
Consumer Loan [Member] | Troubled debt restructures [Member]
Financing receivable credit quality indicators
Total Financing Receivables	$ 411	$ 451