Loans and Asset Quality Information (Details 12) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Non-covered loans	$ 2,114,906	$ 2,069,152
Unamortized net deferred loan costs	1,376	1,280	1,298
Covered loans	322,895	361,234	401,726
Total loans	2,437,801	2,430,386	2,442,440
Commercial Unsecured
Non-covered loans	38,343	38,778
Commercial Secured
Non-covered loans	113,364	111,751
Secured by Inventory and Accounts Receivable
Non-covered loans	21,969	21,828
Real Estate construction, land development and other land loans
Non-covered loans	244,723	246,805
Real estate residential, farmland and mutli-family
Non-covered loans	810,106	795,655
Real estate home equity lines of credit
Non-covered loans	207,686	207,436
Real estate commercial
Non-covered loans	622,508	587,183
Consumer
Non-covered loans	54,831	58,436
Pass (Grades 1, 2 & 3)
Non-covered loans	627,870	650,801
Covered loans	51,912	62,052
Total loans	679,782	712,853
Pass (Grades 1, 2 & 3) \| Commercial Unsecured
Non-covered loans	11,933	13,516
Pass (Grades 1, 2 & 3) \| Commercial Secured
Non-covered loans	34,861	36,587
Pass (Grades 1, 2 & 3) \| Secured by Inventory and Accounts Receivable
Non-covered loans	3,688	3,756
Pass (Grades 1, 2 & 3) \| Real Estate construction, land development and other land loans
Non-covered loans	32,230	37,596
Pass (Grades 1, 2 & 3) \| Real estate residential, farmland and mutli-family
Non-covered loans	250,715	257,163
Pass (Grades 1, 2 & 3) \| Real estate home equity lines of credit
Non-covered loans	131,210	130,913
Pass (Grades 1, 2 & 3) \| Real estate commercial
Non-covered loans	135,080	140,577
Pass (Grades 1, 2 & 3) \| Consumer
Non-covered loans	28,153	30,693
Weak Pass (Grade 4)
Non-covered loans	1,255,788	1,182,646
Covered loans	137,930	161,508
Total loans	1,393,718	1,344,154
Weak Pass (Grade 4) \| Commercial Unsecured
Non-covered loans	25,351	23,735
Weak Pass (Grade 4) \| Commercial Secured
Non-covered loans	69,630	66,105
Weak Pass (Grade 4) \| Secured by Inventory and Accounts Receivable
Non-covered loans	16,539	16,197
Weak Pass (Grade 4) \| Real Estate construction, land development and other land loans
Non-covered loans	161,242	156,651
Weak Pass (Grade 4) \| Real estate residential, farmland and mutli-family
Non-covered loans	476,852	456,188
Weak Pass (Grade 4) \| Real estate home equity lines of credit
Non-covered loans	66,044	67,606
Weak Pass (Grade 4) \| Real estate commercial
Non-covered loans	417,454	372,614
Weak Pass (Grade 4) \| Consumer
Non-covered loans	22,676	23,550
Watch or Standard Loans (Grade 9)
Non-covered loans	46,535	52,156
Covered loans
Total loans	46,535	52,156
Watch or Standard Loans (Grade 9) \| Commercial Unsecured
Non-covered loans	12	13
Watch or Standard Loans (Grade 9) \| Commercial Secured
Non-covered loans	1,705	1,912
Watch or Standard Loans (Grade 9) \| Secured by Inventory and Accounts Receivable
Non-covered loans	265	282
Watch or Standard Loans (Grade 9) \| Real Estate construction, land development and other land loans
Non-covered loans	5,304	6,490
Watch or Standard Loans (Grade 9) \| Real estate residential, farmland and mutli-family
Non-covered loans	9,105	10,248
Watch or Standard Loans (Grade 9) \| Real estate home equity lines of credit
Non-covered loans	2,521	2,422
Watch or Standard Loans (Grade 9) \| Real estate commercial
Non-covered loans	27,537	30,722
Watch or Standard Loans (Grade 9) \| Consumer
Non-covered loans	86	67
Special Mention Loans (Grade 5)
Non-covered loans	49,230	44,497
Covered loans	8,459	8,033
Total loans	57,689	52,530
Special Mention Loans (Grade 5) \| Commercial Unsecured
Non-covered loans	323	217
Special Mention Loans (Grade 5) \| Commercial Secured
Non-covered loans	2,481	2,196
Special Mention Loans (Grade 5) \| Secured by Inventory and Accounts Receivable
Non-covered loans	695	756
Special Mention Loans (Grade 5) \| Real Estate construction, land development and other land loans
Non-covered loans	11,971	9,903
Special Mention Loans (Grade 5) \| Real estate residential, farmland and mutli-family
Non-covered loans	17,883	17,687
Special Mention Loans (Grade 5) \| Real estate home equity lines of credit
Non-covered loans	2,338	1,868
Special Mention Loans (Grade 5) \| Real estate commercial
Non-covered loans	13,025	11,502
Special Mention Loans (Grade 5) \| Consumer
Non-covered loans	514	368
Classified Loans (Grades 6,7 & 8)
Non-covered loans	60,189	64,206
Covered loans	85,519	88,169
Total loans	145,708	152,375
Classified Loans (Grades 6,7 & 8) \| Commercial Unsecured
Non-covered loans	513	845
Classified Loans (Grades 6,7 & 8) \| Commercial Secured
Non-covered loans	2,460	2,761
Classified Loans (Grades 6,7 & 8) \| Secured by Inventory and Accounts Receivable
Non-covered loans	145	249
Classified Loans (Grades 6,7 & 8) \| Real Estate construction, land development and other land loans
Non-covered loans	14,195	13,393
Classified Loans (Grades 6,7 & 8) \| Real estate residential, farmland and mutli-family
Non-covered loans	31,405	28,939
Classified Loans (Grades 6,7 & 8) \| Real estate home equity lines of credit
Non-covered loans	1,695	1,466
Classified Loans (Grades 6,7 & 8) \| Real estate commercial
Non-covered loans	9,135	15,565
Classified Loans (Grades 6,7 & 8) \| Consumer
Non-covered loans	641	988
Nonaccrual Loans
Non-covered loans	73,918	73,566
Covered loans	39,075	41,472
Total loans	112,993	115,038
Nonaccrual Loans \| Commercial Unsecured
Non-covered loans	211	452
Nonaccrual Loans \| Commercial Secured
Non-covered loans	2,227	2,190
Nonaccrual Loans \| Secured by Inventory and Accounts Receivable
Non-covered loans	637	588
Nonaccrual Loans \| Real Estate construction, land development and other land loans
Non-covered loans	19,781	22,772
Nonaccrual Loans \| Real estate residential, farmland and mutli-family
Non-covered loans	24,146	25,430
Nonaccrual Loans \| Real estate home equity lines of credit
Non-covered loans	3,878	3,161
Nonaccrual Loans \| Real estate commercial
Non-covered loans	20,277	16,203
Nonaccrual Loans \| Consumer
Non-covered loans	2,761	2,770
Non-covered
Non-covered loans	$ 2,113,530	$ 2,067,872