Loans and Asset Quality Information (Details 13) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs	46	64
TDRs arising during period Pre-Modification	$ 16,335	$ 14,154
TDRs arising during period Post-Modification	16,152	14,262
Non-covered
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs	36	19
TDRs arising during period Pre-Modification	7,579	6,154
TDRs arising during period Post-Modification	7,579	6,262
Non-covered | Commercial Secured
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Nonaccrual	1
TDRs arising during period - Nonaccrual Pre-Modification	11
TDRs arising during period - Nonaccrual Post-Modification	11
Non-covered | RealEstateConstructionMember
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	2	2
TDRs arising during period - Accruing Pre-Modification	642	501
TDRs arising during period - Accruing Post-Modification	642	543
Number of contracts, TDRs Nonaccrual	2	1
TDRs arising during period - Nonaccrual Pre-Modification	332	357
TDRs arising during period - Nonaccrual Post-Modification	332	357
Non-covered | Real estate residential, farmland and mutli-family
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	8	5
TDRs arising during period - Accruing Pre-Modification	1,653	1,635
TDRs arising during period - Accruing Post-Modification	1,653	1,645
Number of contracts, TDRs Nonaccrual	17	3
TDRs arising during period - Nonaccrual Pre-Modification	3,736	382
TDRs arising during period - Nonaccrual Post-Modification	3,736	438
Non-covered | Real estate home equity lines of credit
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Nonaccrual	1
TDRs arising during period - Nonaccrual Pre-Modification	123
TDRs arising during period - Nonaccrual Post-Modification	123
Non-covered | Real estate commercial
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing		4
TDRs arising during period - Accruing Pre-Modification		1,871
TDRs arising during period - Accruing Post-Modification		1,871
Number of contracts, TDRs Nonaccrual	5	4
TDRs arising during period - Nonaccrual Pre-Modification	1,082	1,408
TDRs arising during period - Nonaccrual Post-Modification	1,082	1,408
Covered
Information related to loans modified in a troubled debt restructuring:
Number of contracts, TDRs Accruing	6	37
TDRs arising during period - Accruing Pre-Modification	7,526	6,528
TDRs arising during period - Accruing Post-Modification	7,342	6,528
Number of contracts, TDRs Nonaccrual	4	8
TDRs arising during period - Nonaccrual Pre-Modification	1,230	1,472
TDRs arising during period - Nonaccrual Post-Modification	$ 1,231	$ 1,472