Parent Company Only Financial Statements Condensed 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]
Premises and equipment, net	$ 29,670	$ 30,717
Other assets	14,511	14,640
Total assets	1,578,032	1,500,956
Other liabilities	7,835	7,745
Total liabilities	1,421,345	1,359,989
Stockholders’ equity	156,687	140,967	112,265	111,221
Total liabilities and stockholders’ equity	1,578,032	1,500,956
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	11,658	20,538
Premises and equipment, net	3,012	3,112
Investment in subsidiaries	162,674	147,225
Other assets	2,415	2,495
Total assets	179,759	173,370
Dividends payable	1,104	2,200
Debt	20,620	28,870
Other liabilities	1,348	1,333
Total liabilities	23,072	32,403
Stockholders’ equity	156,687	140,967
Total liabilities and stockholders’ equity	$ 179,759	$ 173,370