Acquisition of Bank of Granite Corporation (Fair Value of Asset and Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 21, 2011 Granite Corp. [Member]
Assets acquired:
Cash and cash equivalents					$ 99,126
Investment securities					186,361
Loans, net					393,653
Premises and equipment, net					9,778
Other real estate owned					18,136
Bank-owned life insurance					4,432
Core deposit intangible					4,900
Other assets					7,766
Total assets acquired					724,152
Liabilities assumed:
Deposits					719,443
Other					3,990
Total liabilities assumed					723,433
Total shareholders’ equity					0
Total liabilities assumed and shareholders’ equity					723,433
Contributed capital					4,924
Total liabilities assumed and contributed capital					728,357
Goodwill (excess of liabilities assumed and contributed capital over assets acquired)	$ 4,205	$ 4,205	$ 3,905	$ 0	$ 4,205