Loans and Asset Quality Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Covered purchased nonimpaired loans:
Carrying amount of nonimpaired covered loans, beginning balance	$ 207,167	$ 277,489
Principal repayments	(21,393)	(63,588)
Transfers to foreclosed real estate	(1,971)	(13,977)
Loan charge-offs	(2,948)	(12,957)
Accretion of loan discount	6,408	20,200
Balance, ending, carrying value	$ 187,263	$ 207,167