Loans (Summary of Impaired Loans by Classes of Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 27,803	$ 23,234	$ 27,627
Unpaid Principal Balance	28,055	23,648	29,216
Related Valuation Allowance	1,581	1,338	1,719
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	103,066	111,433	99,153
Unpaid Principal Balance	132,985	141,622	119,489
Related Valuation Allowance	0	0	0
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	130,869	134,667	126,780
Unpaid Principal Balance	161,040	165,270	148,705
Related Valuation Allowance	1,581	1,338	1,719
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	4,044	966	2,905
Unpaid Principal Balance	4,137	1,040	3,258
Related Valuation Allowance	718	293	563
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	32,461	38,094	39,420
Unpaid Principal Balance	38,160	44,557	43,463
Related Valuation Allowance	0	0	0
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	36,505	39,060	42,325
Unpaid Principal Balance	42,297	45,597	46,721
Related Valuation Allowance	718	293	563
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,789	2,587	4,369
Unpaid Principal Balance	2,948	2,927	5,605
Related Valuation Allowance	603	710	777
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	56,052	60,616	46,205
Unpaid Principal Balance	78,490	82,693	58,997
Related Valuation Allowance	0	0	0
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	58,841	63,203	50,574
Unpaid Principal Balance	81,438	85,620	64,602
Related Valuation Allowance	603	710	777
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	451	162	160
Unpaid Principal Balance	531	255	366
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	451	162	160
Unpaid Principal Balance	531	255	366
Related Valuation Allowance	0	0	0
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,942	1,928	4,211
Unpaid Principal Balance	3,644	3,484	7,506
Related Valuation Allowance	0	0	0
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,942	1,928	4,211
Unpaid Principal Balance	3,644	3,484	7,506
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	20,970	19,681	20,353
Unpaid Principal Balance	20,970	19,681	20,353
Related Valuation Allowance	260	335	379
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	8,984	7,994	6,325
Unpaid Principal Balance	8,984	7,994	6,325
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	29,954	27,675	26,678
Unpaid Principal Balance	29,954	27,675	26,678
Related Valuation Allowance	260	335	379
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	398	518	536
Unpaid Principal Balance	398	518	536
Related Valuation Allowance	0	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	398	518	536
Unpaid Principal Balance	398	518	536
Related Valuation Allowance	0	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,778	2,121	2,296
Unpaid Principal Balance	2,778	2,121	2,296
Related Valuation Allowance	0	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,778	2,121	2,296
Unpaid Principal Balance	2,778	2,121	2,296
Related Valuation Allowance	$ 0	$ 0	$ 0