Parent Company Statements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 112,936	$ 179,318	$ 136,832	$ 174,931
Other assets	13,366	7,663
Total assets	2,178,952	2,137,148
Liabilities and stockholders' equity
Stockholders’ equity	279,505	272,147	258,128	278,127
Total liabilities and stockholders’ equity	2,178,952	2,137,148
Parent Company [Member]
Assets
Cash and cash equivalents	9,067	8,228
Investment in banking subsidiary	291,485	285,813
Investment in non-bank subsidiaries	14,424	13,518
Other assets	1,174	1,774
Total assets	316,150	309,333
Liabilities and stockholders' equity
Subordinated debentures	36,083	36,083
Accrued liabilities	562	1,103
Stockholders’ equity	279,505	272,147
Total liabilities and stockholders’ equity	$ 316,150	$ 309,333