Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Company's nonaccrual loans:
Nonaccrual loans	$ 56,012	$ 60,574
Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	217	188
Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,998	2,927
Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans	683	557
Real Estate construction, land development and other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	7,820	9,031
Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	28,413	32,244
Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,430	2,851
Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	13,120	12,271
Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans	331	505
Non-covered [Member]
Company's nonaccrual loans:
Nonaccrual loans	47,416	50,066
Non-covered [Member] | Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	217	187
Non-covered [Member] | Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,998	2,927
Non-covered [Member] | Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans	536	454
Non-covered [Member] | Real Estate construction, land development and other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	6,796	7,891
Non-covered [Member] | Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	23,371	24,459
Non-covered [Member] | Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,140	2,573
Non-covered [Member] | Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	11,027	11,070
Non-covered [Member] | Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans	331	505
Covered [Member]
Company's nonaccrual loans:
Nonaccrual loans	8,596	10,508
Covered [Member] | Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans		1
Covered [Member] | Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans
Covered [Member] | Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans	147	103
Covered [Member] | Real Estate construction, land development and other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	1,024	1,140
Covered [Member] | Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	5,042	7,785
Covered [Member] | Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	290	278
Covered [Member] | Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,093	1,201
Covered [Member] | Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans