Allowances for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loans by risk rating
Financing Receivable, Net	$ 1,137,769	$ 1,111,788
Construction and land development [Member]
Loans by risk rating
Financing Receivable, Net	34,021	38,618
Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	110,537	88,475
Commercial real estate [Member]
Loans by risk rating
Financing Receivable, Net	570,441	576,465
1-3 (Pass) [Member] | Construction and land development [Member]
Loans by risk rating
Financing Receivable, Net	25,095	29,719
1-3 (Pass) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	108,669	86,587
1-3 (Pass) [Member] | Commercial real estate [Member]
Loans by risk rating
Financing Receivable, Net	563,658	569,760
4 (Monitor) [Member] | Construction and land development [Member]
Loans by risk rating
Financing Receivable, Net	7,426	7,399
4 (Monitor) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	472	606
4 (Monitor) [Member] | Commercial real estate [Member]
Loans by risk rating
Financing Receivable, Net	4,521	4,424
5 (Substandard) [Member] | Construction and land development [Member]
Loans by risk rating
Financing Receivable, Net
5 (Substandard) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net
5 (Substandard) [Member] | Commercial real estate [Member]
Loans by risk rating
Financing Receivable, Net
6 (Doubtful) [Member] | Construction and land development [Member]
Loans by risk rating
Financing Receivable, Net
6 (Doubtful) [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net
6 (Doubtful) [Member] | Commercial real estate [Member]
Loans by risk rating
Financing Receivable, Net
Impaired [Member] | Construction and land development [Member]
Loans by risk rating
Financing Receivable, Net	1,500	1,500
Impaired [Member] | Commercial and Industrial [Member]
Loans by risk rating
Financing Receivable, Net	1,396	1,282
Impaired [Member] | Commercial real estate [Member]
Loans by risk rating
Financing Receivable, Net	$ 2,262	$ 2,281