Parent Company Only Financial Statements Condensed balance sheets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Premises and equipment, net	$ 27,352,000	$ 28,578,000
Other assets	13,103,000	18,117,000
Total assets	1,607,103,000	1,605,498,000
Dividends payable	530,000	1,140,000
Junior subordinated debentures	20,620,000	20,620,000
Other liabilities	6,806,000	7,277,000
Total liabilities	1,442,187,000	1,456,117,000
Stockholders’ equity	164,916,000	149,381,000	156,687,000	140,967,000
Total liabilities and stockholders’ equity	1,607,103,000	1,605,498,000
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	1,729,000	2,645,000
Premises and equipment, net	2,789,000	2,935,000
Investment in subsidiaries	180,774,000	164,311,000
Other assets	2,248,000	2,584,000
Total assets	187,540,000	172,475,000
Dividends payable	550,000	1,104,000
Junior subordinated debentures	20,620,000	20,620,000
Other liabilities	1,454,000	1,370,000
Total liabilities	22,624,000	23,094,000
Stockholders’ equity	164,916,000	149,381,000
Total liabilities and stockholders’ equity	$ 187,540,000	$ 172,475,000