Loans and Allowance for Loan Losses (Details 12) (Non-acquired loans, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	$ 61,138	$ 72,260	$ 61,771
Recorded Investment With No Allowance	27,044	39,261	29,351
Gross Recorded Investment With Allowance	14,654	17,866	17,884
Total Recorded Investment	41,698	57,127	47,235
Related Allowance	4,802	3,840	4,879
Average Investment In Impaired Loans	43,612	60,273
Interest Income Recognized	80	96
Non acquired nonaccrual loans	56,581	69,857	61,538
Construction and land development
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	22,813	29,648	21,350
Recorded Investment With No Allowance	8,327	17,166	8,659
Gross Recorded Investment With Allowance	3,730	5,819	4,890
Total Recorded Investment	12,057	22,985	13,549
Related Allowance	1,027	2,044	1,573
Average Investment In Impaired Loans	12,790	24,009
Interest Income Recognized	18	17
Non acquired nonaccrual loans	10,218	19,811	11,961
Commercial non-owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	7,832	10,637	7,564
Recorded Investment With No Allowance	2,675	5,731	3,148
Gross Recorded Investment With Allowance	2,186	2,086	2,196
Total Recorded Investment	4,861	7,817	5,344
Related Allowance	2,059	528	411
Average Investment In Impaired Loans	5,168	10,362
Interest Income Recognized	1
Non acquired nonaccrual loans	4,363	6,986	4,780
Commercial non-owner occupied real estate
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	14,581	26,797	16,741
Commercial owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	21,450	20,841	23,566
Recorded Investment With No Allowance	13,138	12,308	15,698
Gross Recorded Investment With Allowance	4,491	4,442	4,514
Total Recorded Investment	17,629	16,750	20,212
Related Allowance	623	275	648
Average Investment In Impaired Loans	18,038	17,888
Interest Income Recognized	48	44
Non acquired nonaccrual loans	11,351	14,622	14,146
Consumer real estate:
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	9,720	8,472	9,860
Consumer owner occupied
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	1,238	4,315	2,040
Recorded Investment With No Allowance		882
Gross Recorded Investment With Allowance	1,177	3,122	1,954
Total Recorded Investment	1,177	4,004	1,954
Related Allowance	200	644	213
Average Investment In Impaired Loans	1,941	2,974
Interest Income Recognized	5	22
Non acquired nonaccrual loans	8,200	7,316	8,025
Home equity loans
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	1,520	1,156	1,835
Commercial and industrial
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	3,105	1,035	2,595
Recorded Investment With No Allowance	1,596	884	464
Gross Recorded Investment With Allowance	338		1,319
Total Recorded Investment	1,934	884	1,783
Related Allowance	84		1,030
Average Investment In Impaired Loans	1,438	1,526
Non acquired nonaccrual loans	2,133	1,561	2,152
Other income producing property
Loans and Allowance for Loan Losses
Unpaid Contractual Principal Balance	4,700	5,784	4,656
Recorded Investment With No Allowance	1,308	2,290	1,382
Gross Recorded Investment With Allowance	2,732	2,397	3,011
Total Recorded Investment	4,040	4,687	4,393
Related Allowance	809	349	1,004
Average Investment In Impaired Loans	4,237	3,514
Interest Income Recognized	8	13
Non acquired nonaccrual loans	5,058	6,070	5,405
Consumer
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	102	214	83
Restructured loans
Loans and Allowance for Loan Losses
Non acquired nonaccrual loans	$ 13,636	$ 12,121	$ 13,151