Loans and Allowance for Loan Losses (Details 10) (Non-acquired loans, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loans and Allowance for Loan Losses
30-59 Days Past Due	$ 7,056	$ 9,942
60-89 Days Past Due	2,707	5,731
90+ Days Past Due	32,257	48,148
Total Past Due	42,020	63,821
Current	2,528,983	2,406,744
Total loans	2,571,003	2,470,565	2,296,200
Construction and land development
Loans and Allowance for Loan Losses
30-59 Days Past Due	812	1,056
60-89 Days Past Due	701	2,793
90+ Days Past Due	10,435	13,176
Total Past Due	11,948	17,025
Current	261,472	293,820
Total loans	273,420	310,845	391,987
Commercial non-owner occupied
Loans and Allowance for Loan Losses
30-59 Days Past Due	1,013	998
60-89 Days Past Due	572	539
90+ Days Past Due	3,605	10,088
Total Past Due	5,190	11,625
Current	284,881	288,073
Total loans	290,071	299,698	320,203
Commercial owner occupied real estate
Loans and Allowance for Loan Losses
30-59 Days Past Due	1,141	2,731
60-89 Days Past Due	40	902
90+ Days Past Due	9,827	12,936
Total Past Due	11,008	16,569
Current	773,144	726,321
Total loans	784,152	742,890	578,587
Consumer owner occupied
Loans and Allowance for Loan Losses
30-59 Days Past Due	1,433	3,288
60-89 Days Past Due	241	762
90+ Days Past Due	4,045	5,819
Total Past Due	5,719	9,869
Current	428,784	381,660
Total loans	434,503	391,529	325,470
Home equity loans
Loans and Allowance for Loan Losses
30-59 Days Past Due	735	889
60-89 Days Past Due	170	360
90+ Days Past Due	395	647
Total Past Due	1,300	1,896
Current	253,984	263,090
Total loans	255,284	264,986	263,961
Commercial and industrial
Loans and Allowance for Loan Losses
30-59 Days Past Due	1,187	389
60-89 Days Past Due	513	142
90+ Days Past Due	549	1,218
Total Past Due	2,249	1,749
Current	277,514	218,705
Total loans	279,763	220,454	202,987
Other income producing property
Loans and Allowance for Loan Losses
30-59 Days Past Due	322	192
60-89 Days Past Due	278	29
90+ Days Past Due	3,253	4,185
Total Past Due	3,853	4,406
Current	129,860	136,287
Total loans	133,713	140,693	124,431
Consumer
Loans and Allowance for Loan Losses
30-59 Days Past Due	364	302
60-89 Days Past Due	151	130
90+ Days Past Due	112	33
Total Past Due	627	465
Current	86,307	84,877
Total loans	86,934	85,342	67,768
Other Loans
Loans and Allowance for Loan Losses
30-59 Days Past Due	49	97
60-89 Days Past Due	41	74
90+ Days Past Due	36	46
Total Past Due	126	217
Current	33,037	13,911
Total loans	$ 33,163	$ 14,128	$ 20,806