Loans and Asset Quality Information (Details 11) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impaired loans with no related allowance - Recorded Investment	$ 47,245	$ 79,423	$ 92,865
Imapired loans with no related allowance - Unpaid Principal Balance	84,187	124,387
Impaired loans with no related allowance - Average Recorded Investment	63,546	86,265
Impaired loans with allowance - Recorded Investment	59,593	61,553
Impaired loans with allowance - Unpaid Principal Balance	71,062	69,674
Impaired loans with related allowance - Related Allowance	8,560	10,910	18,768
Impaired loans with related allowance - Average Recorded Investment	76,425	66,047
Non-covered
Impaired loans with no related allowance - Recorded Investment	12,049	35,721	42,874
Imapired loans with no related allowance - Unpaid Principal Balance	12,774	45,809
Impaired loans with no related allowance - Average Recorded Investment	24,174	37,235
Impaired loans with allowance - Recorded Investment	45,833	49,565
Impaired loans with allowance - Unpaid Principal Balance	52,791	54,004
Impaired loans with related allowance - Related Allowance	5,051	5,804	7,613
Impaired loans with related allowance - Average Recorded Investment	61,024	51,788
Non-covered | Commercial Unsecured
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
Impaired loans with allowance - Recorded Investment	307	452
Impaired loans with allowance - Unpaid Principal Balance	386	454
Impaired loans with related allowance - Related Allowance	58	59
Impaired loans with related allowance - Average Recorded Investment	221	226
Non-covered | Commercial Secured
Impaired loans with no related allowance - Recorded Investment		295
Imapired loans with no related allowance - Unpaid Principal Balance		478
Impaired loans with no related allowance - Average Recorded Investment	87	504
Impaired loans with allowance - Recorded Investment	2,398	1,895
Impaired loans with allowance - Unpaid Principal Balance	2,762	1,899
Impaired loans with related allowance - Related Allowance	436	295
Impaired loans with related allowance - Average Recorded Investment	2,304	1,427
Non-covered | Secured by Inventory and Accounts Receivable
Impaired loans with no related allowance - Recorded Investment		27
Imapired loans with no related allowance - Unpaid Principal Balance		493
Impaired loans with no related allowance - Average Recorded Investment	5	124
Impaired loans with allowance - Recorded Investment	17	561
Impaired loans with allowance - Unpaid Principal Balance	43	571
Impaired loans with related allowance - Related Allowance	4	156
Impaired loans with related allowance - Average Recorded Investment	548	391
Non-covered | RealEstateConstructionMember
Impaired loans with no related allowance - Recorded Investment	4,277	15,105
Imapired loans with no related allowance - Unpaid Principal Balance	4,305	20,941
Impaired loans with no related allowance - Average Recorded Investment	8,600	17,876
Impaired loans with allowance - Recorded Investment	3,934	10,360
Impaired loans with allowance - Unpaid Principal Balance	5,730	12,606
Impaired loans with related allowance - Related Allowance	1,213	2,244
Impaired loans with related allowance - Average Recorded Investment	12,199	15,782
Non-covered | Real estate residential, farmland and mutli-family
Impaired loans with no related allowance - Recorded Investment	1,597	3,442
Imapired loans with no related allowance - Unpaid Principal Balance	1,618	4,741
Impaired loans with no related allowance - Average Recorded Investment	2,692	5,278
Impaired loans with allowance - Recorded Investment	23,859	24,460
Impaired loans with allowance - Unpaid Principal Balance	25,844	26,153
Impaired loans with related allowance - Related Allowance	1,955	2,169
Impaired loans with related allowance - Average Recorded Investment	27,186	22,487
Non-covered | Real estate home equity lines of credit
Impaired loans with no related allowance - Recorded Investment		46
Imapired loans with no related allowance - Unpaid Principal Balance		300
Impaired loans with no related allowance - Average Recorded Investment	64	79
Impaired loans with allowance - Recorded Investment	1,645	3,115
Impaired loans with allowance - Unpaid Principal Balance	2,120	3,141
Impaired loans with related allowance - Related Allowance	96	117
Impaired loans with related allowance - Average Recorded Investment	2,901	2,544
Non-covered | Real estate commercial
Impaired loans with no related allowance - Recorded Investment	6,175	16,794
Imapired loans with no related allowance - Unpaid Principal Balance	6,851	18,817
Impaired loans with no related allowance - Average Recorded Investment	12,724	13,359
Impaired loans with allowance - Recorded Investment	10,851	5,965
Impaired loans with allowance - Unpaid Principal Balance	13,048	6,421
Impaired loans with related allowance - Related Allowance	936	283
Impaired loans with related allowance - Average Recorded Investment	12,863	6,602
Non-covered | Consumer
Impaired loans with no related allowance - Recorded Investment		12
Imapired loans with no related allowance - Unpaid Principal Balance		39
Impaired loans with no related allowance - Average Recorded Investment	2	15
Impaired loans with allowance - Recorded Investment	2,822	2,757
Impaired loans with allowance - Unpaid Principal Balance	2,858	2,759
Impaired loans with related allowance - Related Allowance	353	481
Impaired loans with related allowance - Average Recorded Investment	2,802	2,329
Covered
Impaired loans with no related allowance - Recorded Investment	35,196	43,702	49,991
Imapired loans with no related allowance - Unpaid Principal Balance	71,413	78,578
Impaired loans with no related allowance - Average Recorded Investment	39,372	49,030
Impaired loans with allowance - Recorded Investment	13,760	11,988
Impaired loans with allowance - Unpaid Principal Balance	18,271	15,670
Impaired loans with related allowance - Related Allowance	3,509	5,106	11,155
Impaired loans with related allowance - Average Recorded Investment	$ 15,401	$ 14,259