Condensed Financial Information (Parent Company Only) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets
Total cash and cash equivalents	$ 30,735	$ 20,447	$ 15,683	$ 68,702
Other assets	26,279	18,051
Total assets	1,848,227	1,547,162
Liabilities
Subordinated debentures	32,331	30,676
Other liabilities	16,451	14,449
Stockholders' Equity	158,968	121,465	112,283	114,605
Total liabilities and stockholders' equity	1,848,227	1,547,162
Parent Company [Member]
Assets
Total cash and cash equivalents	13,639	8,262	8,496	11,819
Investment in Bank	180,880	146,125
Other assets	3,497	3,343
Total assets	198,016	157,730
Liabilities
Subordinated debentures	32,331	30,676
Other liabilities	6,717	5,589
Stockholders' Equity	158,968	121,465
Total liabilities and stockholders' equity	$ 198,016	$ 157,730