Loans and Asset Quality Information (Schedule of Nonaccrual Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Company's nonaccrual loans:
Nonaccrual loans	$ 47,720	$ 60,574
Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	492	188
Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,253	2,927
Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans	107	557
Real Estate construction, land development and other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	5,434	9,031
Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	25,206	32,244
Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,472	2,851
Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	11,398	12,271
Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans	358	505
Non-covered [Member]
Company's nonaccrual loans:
Nonaccrual loans	42,347	50,066
Non-covered [Member] | Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	470	187
Non-covered [Member] | Commercial Secured [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,253	2,927
Non-covered [Member] | Secured by Inventory and Accounts Receivable [Member]
Company's nonaccrual loans:
Nonaccrual loans	84	454
Non-covered [Member] | Real Estate construction, land development and other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	5,374	7,891
Non-covered [Member] | Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	21,936	24,459
Non-covered [Member] | Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	2,110	2,573
Non-covered [Member] | Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	9,762	11,070
Non-covered [Member] | Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans	358	505
Covered [Member]
Company's nonaccrual loans:
Nonaccrual loans	5,373	10,508
Covered [Member] | Commercial Unsecured [Member]
Company's nonaccrual loans:
Nonaccrual loans	$ 22	$ 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	$ 23	$ 103
Covered [Member] | Real Estate construction, land development and other land loans [Member]
Company's nonaccrual loans:
Nonaccrual loans	60	1,140
Covered [Member] | Real estate residential, farmland and mutli-family [Member]
Company's nonaccrual loans:
Nonaccrual loans	3,270	7,785
Covered [Member] | Real estate home equity lines of credit [Member]
Company's nonaccrual loans:
Nonaccrual loans	362	278
Covered [Member] | Real estate commercial [Member]
Company's nonaccrual loans:
Nonaccrual loans	$ 1,636	$ 1,201
Covered [Member] | Consumer [Member]
Company's nonaccrual loans:
Nonaccrual loans