Loans and Asset Quality Information (Details 12) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 N	Sep. 30, 2012 N	Sep. 30, 2013 N	Sep. 30, 2012 N
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs	21	14	40	23
TDRs arising during period Pre-Modification	$ 8,536	$ 2,283	$ 10,364	$ 10,650
TDRs arising during period Post-Modification	8,516	2,283	10,338	10,650
Non-covered
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs	20	13	35	16
TDRs arising during period Pre-Modification	8,349	2,282	9,818	3,123
TDRs arising during period Post-Modification	8,349	2,282	9,820	3,123
Non-covered | Commercial Unsecured
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	1		1
TDRs arising during period - Accruing Pre-Modification	66		66
TDRs arising during period - Accruing Post-Modification	66		66
Non-covered | Commercial Secured
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	5		5
TDRs arising during period - Accruing Pre-Modification	322		322
TDRs arising during period - Accruing Post-Modification	322		322
Non-covered | Real Estate construction, land development and other land loans
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	2		2	1
TDRs arising during period - Accruing Pre-Modification	1,261		1,261	300
TDRs arising during period - Accruing Post-Modification	1,261		1,261	300
Number of contracts, TDRs Nonaccrual	3		3	1
TDRs arising during period - Nonaccrual Pre-Modification	800		800	238
TDRs arising during period - Nonaccrual Post-Modification	800		800	238
Non-covered | Real estate residential, farmland and mutli-family
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	1	6	10	7
TDRs arising during period - Accruing Pre-Modification	174	1,205	1,256	1,508
TDRs arising during period - Accruing Post-Modification	174	1,205	1,258	1,508
Number of contracts, TDRs Nonaccrual	3	5	6	5
TDRs arising during period - Nonaccrual Pre-Modification	395	705	604	705
TDRs arising during period - Nonaccrual Post-Modification	395	705	604	705
Non-covered | Real estate commercial
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	4		6
TDRs arising during period - Accruing Pre-Modification	4,933		5,097
TDRs arising during period - Accruing Post-Modification	4,933		5,097
Number of contracts, TDRs Nonaccrual	1	2	1	2
TDRs arising during period - Nonaccrual Pre-Modification	398	372	398	372
TDRs arising during period - Nonaccrual Post-Modification	398	372	398	372
Non-covered | Consumer
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing			1
TDRs arising during period - Accruing Pre-Modification			14
TDRs arising during period - Accruing Post-Modification			14
Covered
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing			4	6
TDRs arising during period - Accruing Pre-Modification			359	7,526
TDRs arising during period - Accruing Post-Modification			351	7,526
Number of contracts, TDRs Nonaccrual	1	1	1	1
TDRs arising during period - Nonaccrual Pre-Modification	187	1	187	1
TDRs arising during period - Nonaccrual Post-Modification	$ 167	$ 1	$ 167	$ 1