Parent Company Only Financial Information (Condensed Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Assets
Cash and due from banks	$ 42,230	$ 36,016
Receivable from subsidiary bank	1,015	828
Total available-for-sale securities	636,880	606,108
Other assets	35,772	36,493
Total assets	2,567,769	2,059,108
Liabilities
Accrued expenses and other liabilities	27,217	21,381
Dividends Payable, Current	24	0
Long-term borrowings	179,083	121,826
Total liabilities	2,227,651	1,837,555
Common stockholders' equity	340,118	221,553	221,728	206,657
Total liabilities and stockholders' equity	2,567,769	2,059,108
Bank
Assets
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	281,360	205,167
Non-Bank
Assets
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	30,693	30,527
Holding Company
Assets
Cash and due from banks	50	50
Interest-bearing deposits in subsidiary bank	41,666	5,541
Total available-for-sale securities	5,214	4,548
Other assets	878	854
Total assets	360,876	247,515
Liabilities
Accrued expenses and other liabilities	6,365	6,815
Long-term borrowings	14,369	19,147
Total liabilities	20,758	25,962
Common stockholders' equity	340,118	221,553
Total liabilities and stockholders' equity	$ 360,876	$ 247,515