Loans (Summary of Impaired Loans by Classes of Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 23,234	$ 22,501
Unpaid Principal Balance	23,648	23,029
Related Valuation Allowance	1,338	1,591
Average Annual Recorded Investment	25,556	33,587
Interest Income Recognized While on Impaired Status	1,252	1,123
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	111,433	106,844
Unpaid Principal Balance	141,622	130,361
Related Valuation Allowance	0	0
Average Annual Recorded Investment	102,320	87,434
Interest Income Recognized While on Impaired Status	3,101	2,641
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	134,667	129,345
Unpaid Principal Balance	165,270	153,390
Related Valuation Allowance	1,338	1,591
Average Annual Recorded Investment	127,876	121,021	133,000
Interest Income Recognized While on Impaired Status	4,353	3,764	3,700
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	966	2,517
Unpaid Principal Balance	1,040	2,656
Related Valuation Allowance	293	728
Average Annual Recorded Investment	2,117	5,398
Interest Income Recognized While on Impaired Status	0	0
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	38,094	38,838
Unpaid Principal Balance	44,557	44,377
Related Valuation Allowance	0	0
Average Annual Recorded Investment	39,020	24,231
Interest Income Recognized While on Impaired Status	1,375	990
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	39,060	41,355
Unpaid Principal Balance	45,597	47,033
Related Valuation Allowance	293	728
Average Annual Recorded Investment	41,137	29,629	27,700
Interest Income Recognized While on Impaired Status	1,375	990	1,000
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,587	2,576
Unpaid Principal Balance	2,927	2,965
Related Valuation Allowance	710	353
Average Annual Recorded Investment	3,699	9,725
Interest Income Recognized While on Impaired Status	0	0
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	60,616	48,220
Unpaid Principal Balance	82,693	61,444
Related Valuation Allowance	0	0
Average Annual Recorded Investment	49,676	41,100
Interest Income Recognized While on Impaired Status	1,567	1,348
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	63,203	50,796
Unpaid Principal Balance	85,620	64,409
Related Valuation Allowance	710	353
Average Annual Recorded Investment	53,375	50,825	58,100
Interest Income Recognized While on Impaired Status	1,567	1,348	1,000
Real estate construction [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Valuation Allowance	0	0
Average Annual Recorded Investment	0	56
Interest Income Recognized While on Impaired Status	0	0
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	162	371
Unpaid Principal Balance	255	478
Related Valuation Allowance	0	0
Average Annual Recorded Investment	164	314
Interest Income Recognized While on Impaired Status	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	162	371
Unpaid Principal Balance	255	478
Related Valuation Allowance	0	0
Average Annual Recorded Investment	164	370	700
Interest Income Recognized While on Impaired Status	0	0
Land development [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Valuation Allowance	0	0
Average Annual Recorded Investment	0	719
Interest Income Recognized While on Impaired Status	0	0
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,928	7,170
Unpaid Principal Balance	3,484	11,817
Related Valuation Allowance	0	0
Average Annual Recorded Investment	3,551	9,075
Interest Income Recognized While on Impaired Status	131	303
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,928	7,170
Unpaid Principal Balance	3,484	11,817
Related Valuation Allowance	0	0
Average Annual Recorded Investment	3,551	9,794	9,100
Interest Income Recognized While on Impaired Status	131	303	400
Real estate residential [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	19,681	17,408
Unpaid Principal Balance	19,681	17,408
Related Valuation Allowance	335	510
Average Annual Recorded Investment	19,740	17,689
Interest Income Recognized While on Impaired Status	1,252	1,123
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	7,994	8,921
Unpaid Principal Balance	7,994	8,921
Related Valuation Allowance	0	0
Average Annual Recorded Investment	7,005	9,147
Interest Income Recognized While on Impaired Status	15	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	27,675	26,329
Unpaid Principal Balance	27,675	26,329
Related Valuation Allowance	335	510
Average Annual Recorded Investment	26,745	26,836	33,400
Interest Income Recognized While on Impaired Status	1,267	1,123	1,400
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	518	676
Unpaid Principal Balance	518	676
Related Valuation Allowance	0	0
Average Annual Recorded Investment	602	653
Interest Income Recognized While on Impaired Status	1	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	518	676
Unpaid Principal Balance	518	676
Related Valuation Allowance	0	0
Average Annual Recorded Investment	602	653	1,100
Interest Income Recognized While on Impaired Status	1	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,121	2,648
Unpaid Principal Balance	2,121	2,648
Related Valuation Allowance	0	0
Average Annual Recorded Investment	2,302	2,914
Interest Income Recognized While on Impaired Status	12	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,121	2,648
Unpaid Principal Balance	2,121	2,648
Related Valuation Allowance	0	0
Average Annual Recorded Investment	2,302	2,914	2,900
Interest Income Recognized While on Impaired Status	$ 12	$ 0