Loans and Asset Quality Information (Details 11) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	$ 63,780	$ 47,245	$ 62,848
Imapired loans with no related allowance - Unpaid Principal Balance	106,728	84,187
Impaired loans with no related allowance - Average Recorded Investment	54,816	63,546
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	61,801	59,593
Impaired loans with allowance - Unpaid Principal Balance	68,073	71,062
Impaired loans with related allowance - Related Allowance	10,660	8,560	16,209
Impaired loans with related allowance - Average Recorded Investment	64,357	76,425
Non-covered
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	20,072	12,049	22,235
Imapired loans with no related allowance - Unpaid Principal Balance	24,106	12,774
Impaired loans with no related allowance - Average Recorded Investment	13,565	24,174
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	48,373	45,833
Impaired loans with allowance - Unpaid Principal Balance	52,579	52,791
Impaired loans with related allowance - Related Allowance	5,960	5,051	11,051
Impaired loans with related allowance - Average Recorded Investment	49,643	61,024
Non-covered | Commercial Unsecured
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment
Imapired loans with no related allowance - Unpaid Principal Balance
Impaired loans with no related allowance - Average Recorded Investment
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	66	307
Impaired loans with allowance - Unpaid Principal Balance	66	386
Impaired loans with related allowance - Related Allowance	48	58
Impaired loans with related allowance - Average Recorded Investment	133	221
Non-covered | Commercial Secured
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	844
Imapired loans with no related allowance - Unpaid Principal Balance	1,066
Impaired loans with no related allowance - Average Recorded Investment	281	87
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	2,924	2,398
Impaired loans with allowance - Unpaid Principal Balance	3,326	2,762
Impaired loans with related allowance - Related Allowance	819	436
Impaired loans with related allowance - Average Recorded Investment	2,568	2,304
Non-covered | Secured by Inventory and Accounts Receivable
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment
Imapired loans with no related allowance - Unpaid Principal Balance
Impaired loans with no related allowance - Average Recorded Investment		5
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	405	17
Impaired loans with allowance - Unpaid Principal Balance	432	43
Impaired loans with related allowance - Related Allowance	377	4
Impaired loans with related allowance - Average Recorded Investment	148	548
Non-covered | Real Estate construction, land development and other land loans
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	5,977	4,277
Imapired loans with no related allowance - Unpaid Principal Balance	6,705	4,305
Impaired loans with no related allowance - Average Recorded Investment	3,935	8,600
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	5,103	3,934
Impaired loans with allowance - Unpaid Principal Balance	6,969	5,730
Impaired loans with related allowance - Related Allowance	1,455	1,213
Impaired loans with related allowance - Average Recorded Investment	5,600	12,199
Non-covered | Real estate residential, farmland and mutli-family
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	1,522	1,597
Imapired loans with no related allowance - Unpaid Principal Balance	1,605	1,618
Impaired loans with no related allowance - Average Recorded Investment	1,040	2,692
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	28,728	23,859
Impaired loans with allowance - Unpaid Principal Balance	29,309	25,844
Impaired loans with related allowance - Related Allowance	2,210	1,955
Impaired loans with related allowance - Average Recorded Investment	26,974	27,186
Non-covered | Real estate home equity lines of credit
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment
Imapired loans with no related allowance - Unpaid Principal Balance
Impaired loans with no related allowance - Average Recorded Investment		64
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	1,519	1,645
Impaired loans with allowance - Unpaid Principal Balance	1,802	2,120
Impaired loans with related allowance - Related Allowance	89	96
Impaired loans with related allowance - Average Recorded Investment	1,555	2,901
Non-covered | Real estate commercial
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	11,729	6,175
Imapired loans with no related allowance - Unpaid Principal Balance	14,730	6,851
Impaired loans with no related allowance - Average Recorded Investment	8,309	12,724
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	8,855	10,851
Impaired loans with allowance - Unpaid Principal Balance	9,557	13,048
Impaired loans with related allowance - Related Allowance	863	936
Impaired loans with related allowance - Average Recorded Investment	11,163	12,863
Non-covered | Consumer
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment
Imapired loans with no related allowance - Unpaid Principal Balance
Impaired loans with no related allowance - Average Recorded Investment		2
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	773	2,822
Impaired loans with allowance - Unpaid Principal Balance	1,118	2,858
Impaired loans with related allowance - Related Allowance	99	353
Impaired loans with related allowance - Average Recorded Investment	1,502	2,802
Covered
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	43,708	35,196	40,613
Imapired loans with no related allowance - Unpaid Principal Balance	82,622	71,413
Impaired loans with no related allowance - Average Recorded Investment	41,251	39,372
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	13,428	13,760
Impaired loans with allowance - Unpaid Principal Balance	15,494	18,271
Impaired loans with related allowance - Related Allowance	4,700	3,509	5,158
Impaired loans with related allowance - Average Recorded Investment	$ 14,714	$ 15,401