Loans and Asset Quality Information (Details 6) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Company's nonaccrual loans:
Nonaccrual loans	$ 68,471	$ 79,155
Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	115	260
Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans	3,905	2,776
Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans	338	1,327
Real estate construction, land development other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	14,300	21,557
Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	28,383	30,158
Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,677	2,535
Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	18,196	20,214
Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans	557	328
Non-covered [Member]
Company's nonaccrual loans:
Nonaccrual loans	47,533	41,938
Non-covered [Member] | Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	110	222
Non-covered [Member] | Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans	3,628	2,662
Non-covered [Member] | Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans	338	545
Non-covered [Member] | Real estate construction, land development other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	9,001	8,055
Non-covered [Member] | Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	21,168	17,814
Non-covered [Member] | Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,436	2,200
Non-covered [Member] | Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	10,297	10,115
Non-covered [Member] | Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans	555	325
Covered [Member]
Company's nonaccrual loans:
Nonaccrual loans	20,938	37,217
Covered [Member] | Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	5	38
Covered [Member] | Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans	277	114
Covered [Member] | Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans		782
Covered [Member] | Real estate construction, land development other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	5,299	13,502
Covered [Member] | Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	7,215	12,344
Covered [Member] | Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	241	335
Covered [Member] | Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	7,899	10,099
Covered [Member] | Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans	$ 2	$ 3