Loans and Allowance for Loan Losses (Details 12) (Non-acquired loans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	$ 61,771	$ 78,413
Recorded Investment With No Allowance	29,351	44,232
Gross Recorded Investment With Allowance	17,884	17,819
Total Recorded Investment	47,235	62,051
Related Allowance	4,879	4,413
Average Investment In Impaired Loans	49,326	51,625
Interest Income Recognized	751	1,300
Non acquired nonaccrual loans	61,538	75,977
Construction and land development
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	21,350	34,076
Recorded Investment With No Allowance	8,659	19,521
Gross Recorded Investment With Allowance	4,890	5,228
Total Recorded Investment	13,549	24,749
Related Allowance	1,573	1,646
Average Investment In Impaired Loans	18,048	22,365
Interest Income Recognized	114	429
Non acquired nonaccrual loans	11,961	21,347
Commercial non-owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	7,564	14,269
Recorded Investment With No Allowance	3,148	9,704
Gross Recorded Investment With Allowance	2,196	2,336
Total Recorded Investment	5,344	12,040
Related Allowance	411	706
Average Investment In Impaired Loans	7,503	11,522
Interest Income Recognized	85	138
Non acquired nonaccrual loans	4,780	10,931
Commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	16,741	32,278
Commercial owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	23,566	21,072
Recorded Investment With No Allowance	15,698	10,692
Gross Recorded Investment With Allowance	4,514	7,025
Total Recorded Investment	20,212	17,717
Related Allowance	648	1,510
Average Investment In Impaired Loans	17,460	12,664
Interest Income Recognized	347	484
Non acquired nonaccrual loans	14,146	15,405
Consumer real estate:
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	9,860	9,022
Consumer owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,040	2,815
Recorded Investment With No Allowance		607
Gross Recorded Investment With Allowance	1,954	1,987
Total Recorded Investment	1,954	2,594
Related Allowance	213	262
Average Investment In Impaired Loans	2,223	2,180
Interest Income Recognized	65	40
Non acquired nonaccrual loans	8,025	8,017
Home equity loans
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	1,835	1,005
Commercial and industrial
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	2,595	1,788
Recorded Investment With No Allowance	464	1,576
Gross Recorded Investment With Allowance	1,319
Total Recorded Investment	1,783	1,576
Related Allowance	1,030
Average Investment In Impaired Loans	921	1,215
Interest Income Recognized	23	104
Non acquired nonaccrual loans	2,152	1,913
Other income producing property
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	4,656	4,393
Recorded Investment With No Allowance	1,382	2,132
Gross Recorded Investment With Allowance	3,011	1,243
Total Recorded Investment	4,393	3,375
Related Allowance	1,004	289
Average Investment In Impaired Loans	3,171	1,679
Interest Income Recognized	117	105
Non acquired nonaccrual loans	5,405	5,329
Consumer
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	83	223
Restructured loans
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	$ 13,151	$ 11,807