Loans and Asset Quality Information (Details 10) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	$ 72,614	$ 49,054
Imapired loans with no related allowance - Unpaid Principal Balance	105,142	85,996
Impaired loans with no related allowance - Average Recorded Investment	59,414	67,236
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	32,002	42,046
Impaired loans with allowance - Unpaid Principal Balance	34,672	51,688
Impaired loans with related allowance - Related Allowance	4,914	6,473
Impaired loans with related allowance - Average Recorded Investment	36,907	53,235
Non-covered
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	29,349	13,858
Imapired loans with no related allowance - Unpaid Principal Balance	33,207	14,583
Impaired loans with no related allowance - Average Recorded Investment	17,660	27,864
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	21,497	28,286
Impaired loans with allowance - Unpaid Principal Balance	22,882	33,417
Impaired loans with related allowance - Related Allowance	2,470	2,964
Impaired loans with related allowance - Average Recorded Investment	23,245	37,834
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	65
Impaired loans with allowance - Unpaid Principal Balance	65
Impaired loans with related allowance - Related Allowance	13
Impaired loans with related allowance - Average Recorded Investment	61	137
Non-covered | Commercial Secured
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	824
Imapired loans with no related allowance - Unpaid Principal Balance	1,062
Impaired loans with no related allowance - Average Recorded Investment	417	87
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	331	10
Impaired loans with allowance - Unpaid Principal Balance	331	10
Impaired loans with related allowance - Related Allowance	52	2
Impaired loans with related allowance - Average Recorded Investment	1,253	1,428
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	75
Impaired loans with allowance - Unpaid Principal Balance	75
Impaired loans with related allowance - Related Allowance	75
Impaired loans with related allowance - Average Recorded Investment	81	340
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	6,824	4,276
Imapired loans with no related allowance - Unpaid Principal Balance	7,210	4,305
Impaired loans with no related allowance - Average Recorded Investment	4,657	8,600
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	1,245	1,673
Impaired loans with allowance - Unpaid Principal Balance	1,332	2,889
Impaired loans with related allowance - Related Allowance	329	504
Impaired loans with related allowance - Average Recorded Investment	2,516	7,563
Non-covered | Real estate residential, farmland and mutli-family
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	4,643	1,597
Imapired loans with no related allowance - Unpaid Principal Balance	4,855	1,618
Impaired loans with no related allowance - Average Recorded Investment	1,941	2,692
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	15,260	17,021
Impaired loans with allowance - Unpaid Principal Balance	15,635	18,866
Impaired loans with related allowance - Related Allowance	1,298	1,419
Impaired loans with related allowance - Average Recorded Investment	12,964	16,855
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	22	43
Impaired loans with allowance - Unpaid Principal Balance	22	293
Impaired loans with related allowance - Related Allowance	1	3
Impaired loans with related allowance - Average Recorded Investment	791	1,799
Non-covered | Real estate commercial
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	17,058	7,985
Imapired loans with no related allowance - Unpaid Principal Balance	20,080	8,660
Impaired loans with no related allowance - Average Recorded Investment	10,645	16,414
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	4,485	9,539
Impaired loans with allowance - Unpaid Principal Balance	5,385	11,328
Impaired loans with related allowance - Related Allowance	700	1,036
Impaired loans with related allowance - Average Recorded Investment	5,000	7,975
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	14
Impaired loans with allowance - Unpaid Principal Balance	37	31
Impaired loans with related allowance - Related Allowance	2
Impaired loans with related allowance - Average Recorded Investment	579	1,737
Covered
Loans with no related allowance recorded:
Impaired loans with no related allowance - Recorded Investment	43,265	35,196
Imapired loans with no related allowance - Unpaid Principal Balance	71,935	71,413
Impaired loans with no related allowance - Average Recorded Investment	41,754	39,372
Loans with an allowance recorded:
Impaired loans with allowance - Recorded Investment	10,505	13,760
Impaired loans with allowance - Unpaid Principal Balance	11,790	18,271
Impaired loans with related allowance - Related Allowance	2,444	3,509
Impaired loans with related allowance - Average Recorded Investment	$ 13,662	$ 15,401