Parent Company (Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items]
Other assets	$ 21,228	$ 16,690
Total assets	1,708,550	1,611,869
Other liabilities	8,627	18,744
Shareholders' equity	118,221	109,537	99,331	90,625
Total liabilities and shareholders' equity	1,708,550	1,611,869
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries	135,373	127,581
Cash	4,116	3,395
Other assets	526	696
Total assets	140,015	131,672
Other liabilities	1,175	1,516
Long term debt	20,619	20,619
Shareholders' equity	118,221	109,537
Total liabilities and shareholders' equity	$ 140,015	$ 131,672