Loans (Summary of Impaired Loans by Classes of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 27,198	$ 22,501	$ 34,519
Unpaid Principal Balance	27,526	23,029	35,272
Related Valuation Allowance	2,065	1,591	6,184
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	101,297	106,844	89,979
Unpaid Principal Balance	122,701	130,361	112,891
Related Valuation Allowance	0	0	0
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	128,495	129,345	124,498
Unpaid Principal Balance	150,227	153,390	148,163
Related Valuation Allowance	2,065	1,591	6,184
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,534	2,517	4,347
Unpaid Principal Balance	3,704	2,656	4,931
Related Valuation Allowance	1,250	728	1,629
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	38,150	38,838	21,565
Unpaid Principal Balance	42,914	44,377	26,737
Related Valuation Allowance	0	0	0
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	41,684	41,355	25,912
Unpaid Principal Balance	46,618	47,033	31,668
Related Valuation Allowance	1,250	728	1,629
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,720	2,576	12,876
Unpaid Principal Balance	3,878	2,965	13,045
Related Valuation Allowance	371	353	3,893
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	49,074	48,220	42,852
Unpaid Principal Balance	62,207	61,444	56,259
Related Valuation Allowance	0	0	0
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	52,794	50,796	55,728
Unpaid Principal Balance	66,085	64,409	69,304
Related Valuation Allowance	371	353	3,893
Real estate construction [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	160	371	372
Unpaid Principal Balance	366	478	442
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	160	371	372
Unpaid Principal Balance	366	478	442
Related Valuation Allowance	0	0	0
Land development [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	0	0	0
Unpaid Principal Balance	0	0	0
Related Valuation Allowance	0	0	0
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	4,472	7,170	11,247
Unpaid Principal Balance	7,773	11,817	15,510
Related Valuation Allowance	0	0	0
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	4,472	7,170	11,247
Unpaid Principal Balance	7,773	11,817	15,510
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	19,944	17,408	17,296
Unpaid Principal Balance	19,944	17,408	17,296
Related Valuation Allowance	444	510	662
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	6,589	8,921	10,407
Unpaid Principal Balance	6,589	8,921	10,407
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	26,533	26,329	27,703
Unpaid Principal Balance	26,533	26,329	27,703
Related Valuation Allowance	444	510	662
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	806	676	699
Unpaid Principal Balance	806	676	699
Related Valuation Allowance	0	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	806	676	699
Unpaid Principal Balance	806	676	699
Related Valuation Allowance	0	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,046	2,648	2,837
Unpaid Principal Balance	2,046	2,648	2,837
Related Valuation Allowance	0	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,046	2,648	2,837
Unpaid Principal Balance	2,046	2,648	2,837
Related Valuation Allowance	$ 0	$ 0	$ 0