Loans (Summary of Impaired Loans by Classes of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 30,174	$ 42,961	$ 45,322
Unpaid Principal Balance	32,341	43,751	48,835
Related Valuation Allowance	4,223	8,108	8,659
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	85,666	86,002	83,254
Unpaid Principal Balance	108,095	106,354	103,145
Related Valuation Allowance	0	0	0
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	115,840	128,963	128,576
Unpaid Principal Balance	140,436	150,105	151,980
Related Valuation Allowance	4,223	8,108	8,659
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	5,059	6,368	6,743
Unpaid Principal Balance	5,803	6,818	7,357
Related Valuation Allowance	1,857	1,966	2,240
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	21,543	23,230	19,768
Unpaid Principal Balance	25,642	27,959	24,517
Related Valuation Allowance	0	0	0
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	26,602	29,598	26,511
Unpaid Principal Balance	31,445	34,777	31,874
Related Valuation Allowance	1,857	1,966	2,240
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	6,684	17,267	19,694
Unpaid Principal Balance	7,901	17,607	22,593
Related Valuation Allowance	1,651	5,359	5,344
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	43,178	37,223	36,225
Unpaid Principal Balance	57,256	48,531	48,187
Related Valuation Allowance	0	0	0
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	49,862	54,490	55,919
Unpaid Principal Balance	65,157	66,138	70,780
Related Valuation Allowance	1,651	5,359	5,344
Real estate construction [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	183	171	127
Unpaid Principal Balance	253	171	127
Related Valuation Allowance	33	75	43
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	133	1,046	806
Unpaid Principal Balance	133	1,116	806
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	316	1,217	933
Unpaid Principal Balance	386	1,287	933
Related Valuation Allowance	33	75	43
Land development [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	517	254	2,800
Unpaid Principal Balance	653	254	2,800
Related Valuation Allowance	97	50	383
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	9,095	10,867	7,723
Unpaid Principal Balance	13,347	15,112	10,903
Related Valuation Allowance	0	0	0
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	9,612	11,121	10,523
Unpaid Principal Balance	14,000	15,366	13,703
Related Valuation Allowance	97	50	383
Real estate residential [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	17,731	18,901	15,958
Unpaid Principal Balance	17,731	18,901	15,958
Related Valuation Allowance	585	658	649
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	8,029	10,164	14,907
Unpaid Principal Balance	8,029	10,164	14,907
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	25,760	29,065	30,865
Unpaid Principal Balance	25,760	29,065	30,865
Related Valuation Allowance	585	658	649
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	665	739	876
Unpaid Principal Balance	665	739	876
Related Valuation Allowance	0	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	665	739	876
Unpaid Principal Balance	665	739	876
Related Valuation Allowance	0	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,023	2,733	2,949
Unpaid Principal Balance	3,023	2,733	2,949
Related Valuation Allowance	0	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,023	2,733	2,949
Unpaid Principal Balance	3,023	2,733	2,949
Related Valuation Allowance	$ 0	$ 0	$ 0