Loans and Allowance for Loan Losses (Details 12) (Non-acquired loans, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	$ 42,468	$ 63,588	$ 42,468	$ 63,588	$ 61,771
Recorded Investment With No Allowance	19,381	30,155	19,381	30,155	29,351
Gross Recorded Investment With Allowance	10,203	13,888	10,203	13,888	17,884
Total Recorded Investment	29,584	44,043	29,584	44,043	47,235
Related Allowance	1,301	2,572	1,301	2,572	4,879
Average Investment In Impaired Loans	34,123	43,744	37,545	50,520
Interest Income Recognized	89	237	193	470
Non acquired nonaccrual loans	49,468	59,177	49,468	59,177	61,538
Construction and land development
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	15,447	22,233	15,447	22,233	21,350
Recorded Investment With No Allowance	4,986	9,479	4,986	9,479	8,659
Gross Recorded Investment With Allowance	3,215	3,201	3,215	3,201	4,890
Total Recorded Investment	8,201	12,680	8,201	12,680	13,549
Related Allowance	558	1,151	558	1,151	1,573
Average Investment In Impaired Loans	9,028	15,644	11,151	18,785
Interest Income Recognized	42	12	69	63
Non acquired nonaccrual loans	8,058	12,717	8,058	12,717	11,961
Commercial non-owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	4,543	11,354	4,543	11,354	7,564
Recorded Investment With No Allowance	1,269	4,095	1,269	4,095	3,148
Gross Recorded Investment With Allowance	1,535	3,026	1,535	3,026	2,196
Total Recorded Investment	2,804	7,121	2,804	7,121	5,344
Related Allowance		676		676	411
Average Investment In Impaired Loans	3,779	5,766	4,325	8,006
Interest Income Recognized		54	1	69
Non acquired nonaccrual loans	2,804	5,526	2,804	5,526	4,780
Commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	10,862	18,243	10,862	18,243	16,741
Commercial owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	17,826	23,148	17,826	23,148	23,566
Recorded Investment With No Allowance	12,166	13,021	12,166	13,021	15,698
Gross Recorded Investment With Allowance	2,517	5,356	2,517	5,356	4,514
Total Recorded Investment	14,683	18,377	14,683	18,377	20,212
Related Allowance	19	402	19	402	648
Average Investment In Impaired Loans	16,004	16,397	15,791	16,683
Interest Income Recognized	33	154	94	262
Non acquired nonaccrual loans	10,184	11,554	10,184	11,554	14,146
Consumer real estate
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	11,834	10,447	11,834	10,447	9,860
Consumer owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	625	2,774	625	2,774	2,040
Recorded Investment With No Allowance		1,418		1,418
Gross Recorded Investment With Allowance	575	1,195	575	1,195	1,954
Total Recorded Investment	575	2,613	575	2,613	1,954
Related Allowance	21	218	21	218	213
Average Investment In Impaired Loans	1,066	2,640	1,093	2,530
Interest Income Recognized		12	7	54
Non acquired nonaccrual loans	10,579	9,929	10,579	9,929	8,025
Home equity loans
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	1,255	518	1,255	518	1,835
Commercial and industrial
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	954	550	954	550	2,595
Recorded Investment With No Allowance	707	474	707	474	464
Gross Recorded Investment With Allowance					1,319
Total Recorded Investment	707	474	707	474	1,783
Related Allowance					1,030
Average Investment In Impaired Loans	1,253	477	1,329	1,065
Interest Income Recognized		1		1
Non acquired nonaccrual loans	987	1,349	987	1,349	2,152
Other income producing property
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	3,073	3,529	3,073	3,529	4,656
Recorded Investment With No Allowance	253	1,668	253	1,668	1,382
Gross Recorded Investment With Allowance	2,361	1,110	2,361	1,110	3,011
Total Recorded Investment	2,614	2,778	2,614	2,778	4,393
Related Allowance	703	125	703	125	1,004
Average Investment In Impaired Loans	2,993	2,820	3,856	3,451
Interest Income Recognized	14	4	22	21
Non acquired nonaccrual loans	4,701	4,481	4,701	4,481	5,405
Consumer
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	63	221	63	221	83
Restructured loans
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	$ 10,837	$ 12,882	$ 10,837	$ 12,882	$ 13,151
Number of months generally required to return to accruing status				6 months