Loans and Asset Quality Information (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Additions due to acquisition of The Bank of Asheville (at fair value)		$ 17,645
Transfers to foreclosed real estate	(4,149)	(10,573)
Loan charge-offs	172	(3,329)
Accretion of loan discount	16,466	11,598
Covered
Carrying amount of nonimpaired covered loans, beginning balance	353,370	366,521
Additions due to acquisition of The Bank of Asheville (at fair value)		84,623
Principal repayments	(51,582)	(40,576)
Transfers to foreclosed real estate	(30,181)	(53,999)
Loan charge-offs	(10,584)	(14,797)
Accretion of loan discount	16,466	11,598
Balance, ending, carrying value	$ 277,489	$ 353,370