Loans and Allowance for Loan Losses (Details 10) (Non-acquired loans, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Loans and Allowance for Loan Losses
30-59 Days Past Due	$ 9,789	$ 7,056	$ 9,670
60-89 Days Past Due	4,693	2,707	6,420
90+ Days Past Due	19,669	32,257	32,016
Total Past Due	34,151	42,020	48,106
Current	2,707,091	2,528,983	2,469,246
Total loans	2,741,242	2,571,003	2,517,352
Construction and land development
Loans and Allowance for Loan Losses
30-59 Days Past Due	2,239	812	1,751
60-89 Days Past Due	2,181	701	902
90+ Days Past Due	4,834	10,435	10,789
Total Past Due	9,254	11,948	13,442
Current	278,945	261,472	260,164
Total loans	288,199	273,420	273,606
Commercial non-owner occupied
Loans and Allowance for Loan Losses
30-59 Days Past Due	1,658	1,013	343
60-89 Days Past Due	15	572	1,364
90+ Days Past Due	2,493	3,605	4,253
Total Past Due	4,166	5,190	5,960
Current	278,512	284,881	272,975
Total loans	282,678	290,071	278,935
Commercial owner occupied
Loans and Allowance for Loan Losses
30-59 Days Past Due	1,009	1,141	3,195
60-89 Days Past Due	334	40	2,703
90+ Days Past Due	5,924	9,827	7,137
Total Past Due	7,267	11,008	13,035
Current	806,992	773,144	774,588
Total loans	814,259	784,152	787,623
Consumer owner occupied
Loans and Allowance for Loan Losses
30-59 Days Past Due	2,806	1,433	1,731
60-89 Days Past Due	1,449	241	501
90+ Days Past Due	2,755	4,045	5,007
Total Past Due	7,010	5,719	7,239
Current	491,724	428,784	423,586
Total loans	498,734	434,503	430,825
Home equity loans
Loans and Allowance for Loan Losses
30-59 Days Past Due	767	735	982
60-89 Days Past Due	168	170	416
90+ Days Past Due	503	395	597
Total Past Due	1,438	1,300	1,995
Current	253,853	253,984	253,682
Total loans	255,291	255,284	255,677
Commercial and industrial
Loans and Allowance for Loan Losses
30-59 Days Past Due	139	1,187	425
60-89 Days Past Due	103	513	280
90+ Days Past Due	672	549	384
Total Past Due	914	2,249	1,089
Current	300,931	277,514	244,196
Total loans	301,845	279,763	245,285
Other income producing property
Loans and Allowance for Loan Losses
30-59 Days Past Due	818	322	441
60-89 Days Past Due	218	278	58
90+ Days Past Due	2,395	3,253	3,746
Total Past Due	3,431	3,853	4,245
Current	136,593	129,860	127,587
Total loans	140,024	133,713	131,832
Consumer
Loans and Allowance for Loan Losses
30-59 Days Past Due	300	364	722
60-89 Days Past Due	201	151	161
90+ Days Past Due	61	112	56
Total Past Due	562	627	939
Current	115,750	86,307	85,790
Total loans	116,312	86,934	86,729
Other Loans
Loans and Allowance for Loan Losses
30-59 Days Past Due	53	49	80
60-89 Days Past Due	24	41	35
90+ Days Past Due	32	36	47
Total Past Due	109	126	162
Current	43,791	33,037	26,678
Total loans	$ 43,900	$ 33,163	$ 26,840