Loans and Asset Quality Information (Details 8) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Analysis of the payment status of loans
30-59 Days Past Due	$ 22,755	$ 23,654
60-89 Days Past Due	7,524	8,137
Nonaccrual loans	90,138	66,525
Current	2,274,411	2,276,817
Total loans	2,132,683	2,094,143	2,094,524
[UnamortizedNetDeferredLoanCosts]	1,323	1,324	1,340
Total Covered Loans - Carrying Value	263,468	282,314	342,100
Loans	2,396,151	2,376,457	2,436,624
Commercial Unsecured
Analysis of the payment status of loans
Nonaccrual loans	215	457
Commercial Secured
Analysis of the payment status of loans
Nonaccrual loans	2,385	2,401
Secured by Inventory and Accounts Receivable
Analysis of the payment status of loans
Nonaccrual loans	262	76
Real Estate construction, land development and other land loans
Analysis of the payment status of loans
Nonaccrual loans	25,565	18,052
Real estate residential, farmland and mutli-family
Analysis of the payment status of loans
Nonaccrual loans	28,225	20,341
Real estate home equity lines of credit
Analysis of the payment status of loans
Nonaccrual loans	2,000	2,087
Real estate commercial
Analysis of the payment status of loans
Nonaccrual loans	30,512	20,227
Consumer
Analysis of the payment status of loans
Nonaccrual loans	974	2,884
Non-covered
Analysis of the payment status of loans
30-59 Days Past Due	13,529	17,090
60-89 Days Past Due	4,727	4,720
Nonaccrual loans	38,917	33,034
Current	2,074,187	2,037,975
Total loans	2,131,360	2,092,819
Non-covered | Commercial Unsecured
Analysis of the payment status of loans
30-59 Days Past Due	73	91
60-89 Days Past Due	127	10
Nonaccrual loans	26	307
Current	34,888	35,278
Total loans	35,114	35,686
Non-covered | Commercial Secured
Analysis of the payment status of loans
30-59 Days Past Due	948	1,020
60-89 Days Past Due	242	220
Nonaccrual loans	2,382	2,398
Current	113,026	110,074
Total loans	116,598	113,712
Non-covered | Secured by Inventory and Accounts Receivable
Analysis of the payment status of loans
30-59 Days Past Due	141	52
60-89 Days Past Due	19	4
Nonaccrual loans	23	17
Current	19,826	21,270
Total loans	20,009	21,343
Non-covered | Real Estate construction, land development and other land loans
Analysis of the payment status of loans
30-59 Days Past Due	1,554	490
60-89 Days Past Due	1,871	263
Nonaccrual loans	7,118	6,354
Current	210,159	211,001
Total loans	220,702	218,108
Non-covered | Real estate residential, farmland and mutli-family
Analysis of the payment status of loans
30-59 Days Past Due	8,158	9,673
60-89 Days Past Due	1,343	2,553
Nonaccrual loans	13,551	9,629
Current	815,221	797,584
Total loans	838,273	819,439
Non-covered | Real estate home equity lines of credit
Analysis of the payment status of loans
30-59 Days Past Due	521	976
60-89 Days Past Due	381	320
Nonaccrual loans	1,479	1,622
Current	197,755	197,962
Total loans	200,136	200,880
Non-covered | Real estate commercial
Analysis of the payment status of loans
30-59 Days Past Due	1,770	4,326
60-89 Days Past Due	618	1,131
Nonaccrual loans	13,428	9,885
Current	632,916	612,598
Total loans	648,732	627,940
Non-covered | Consumer
Analysis of the payment status of loans
30-59 Days Past Due	364	462
60-89 Days Past Due	126	219
Nonaccrual loans	910	2,822
Current	50,396	52,208
Total loans	51,796	55,711
Covered
Analysis of the payment status of loans
30-59 Days Past Due	9,226	6,564
60-89 Days Past Due	2,797	3,417
Nonaccrual loans	51,221	33,491
Current	200,224	238,842
Total loans	263,468	282,314
Total Covered Loans - Carrying Value	263,468	282,314	342,100
Covered | Commercial Unsecured
Analysis of the payment status of loans
Nonaccrual loans	189	150
Covered | Commercial Secured
Analysis of the payment status of loans
Nonaccrual loans	3	3
Covered | Secured by Inventory and Accounts Receivable
Analysis of the payment status of loans
Nonaccrual loans	239	59
Covered | Real Estate construction, land development and other land loans
Analysis of the payment status of loans
Nonaccrual loans	18,447	11,698
Covered | Real estate residential, farmland and mutli-family
Analysis of the payment status of loans
Nonaccrual loans	14,674	10,712
Covered | Real estate home equity lines of credit
Analysis of the payment status of loans
Nonaccrual loans	521	465
Covered | Real estate commercial
Analysis of the payment status of loans
Nonaccrual loans	17,084	10,342
Covered | Consumer
Analysis of the payment status of loans
Nonaccrual loans	$ 64	$ 62