Loans (Summary of Impaired Loans by Classes of Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 44,383	$ 23,234
Unpaid Principal Balance	45,151	23,648
Related Valuation Allowance	6,389	1,338
Average Annual Recorded Investment	33,090	25,556
Interest Income Recognized While on Impaired Status	1,312	1,252
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	97,815	111,433
Unpaid Principal Balance	122,367	141,622
Related Valuation Allowance	0	0
Average Annual Recorded Investment	102,640	102,320
Interest Income Recognized While on Impaired Status	3,628	3,101
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	142,198	134,667
Unpaid Principal Balance	167,518	165,270
Related Valuation Allowance	6,389	1,338
Average Annual Recorded Investment	135,730	127,876	$ 121,000
Interest Income Recognized While on Impaired Status	4,940	4,353	3,800
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	18,898	966
Unpaid Principal Balance	19,426	1,040
Related Valuation Allowance	5,700	293
Average Annual Recorded Investment	9,511	2,117
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	31,039	38,094
Unpaid Principal Balance	37,703	44,557
Related Valuation Allowance	0	0
Average Annual Recorded Investment	32,172	39,020
Interest Income Recognized While on Impaired Status	1,303	1,375
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	49,937	39,060
Unpaid Principal Balance	57,129	45,597
Related Valuation Allowance	5,700	293
Average Annual Recorded Investment	41,683	41,137	29,600
Interest Income Recognized While on Impaired Status	1,303	1,375	1,000
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	4,448	2,587
Unpaid Principal Balance	4,688	2,927
Related Valuation Allowance	497	710
Average Annual Recorded Investment	2,918	3,699
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	53,518	60,616
Unpaid Principal Balance	69,130	82,693
Related Valuation Allowance	0	0
Average Annual Recorded Investment	56,562	49,676
Interest Income Recognized While on Impaired Status	1,985	1,567
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	57,966	63,203
Unpaid Principal Balance	73,818	85,620
Related Valuation Allowance	497	710
Average Annual Recorded Investment	59,480	53,375	50,800
Interest Income Recognized While on Impaired Status	1,985	1,567	1,300
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	400	162
Unpaid Principal Balance	480	255
Related Valuation Allowance	0	0
Average Annual Recorded Investment	457	164
Interest Income Recognized While on Impaired Status	11	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	400	162
Unpaid Principal Balance	480	255
Related Valuation Allowance	0	0
Average Annual Recorded Investment	457	164	400
Interest Income Recognized While on Impaired Status	11	0
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,736	1,928
Unpaid Principal Balance	2,628	3,484
Related Valuation Allowance	0	0
Average Annual Recorded Investment	1,768	3,551
Interest Income Recognized While on Impaired Status	104	131
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	1,736	1,928
Unpaid Principal Balance	2,628	3,484
Related Valuation Allowance	0	0
Average Annual Recorded Investment	1,768	3,551	9,800
Interest Income Recognized While on Impaired Status	104	131	300
Real estate residential [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	21,037	19,681
Unpaid Principal Balance	21,037	19,681
Related Valuation Allowance	192	335
Average Annual Recorded Investment	20,661	19,740
Interest Income Recognized While on Impaired Status	1,312	1,252
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	7,638	7,994
Unpaid Principal Balance	8,644	7,994
Related Valuation Allowance	0	0
Average Annual Recorded Investment	8,465	7,005
Interest Income Recognized While on Impaired Status	165	15
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	28,675	27,675
Unpaid Principal Balance	29,681	27,675
Related Valuation Allowance	192	335
Average Annual Recorded Investment	29,126	26,745	26,800
Interest Income Recognized While on Impaired Status	1,477	1,267	1,100
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	498	518
Unpaid Principal Balance	512	518
Related Valuation Allowance	0	0
Average Annual Recorded Investment	480	602
Interest Income Recognized While on Impaired Status	2	1
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	498	518
Unpaid Principal Balance	512	518
Related Valuation Allowance	0	0
Average Annual Recorded Investment	480	602	700
Interest Income Recognized While on Impaired Status	2	1
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,986	2,121
Unpaid Principal Balance	3,270	2,121
Related Valuation Allowance	0	0
Average Annual Recorded Investment	2,736	2,302
Interest Income Recognized While on Impaired Status	58	12
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,986	2,121
Unpaid Principal Balance	3,270	2,121
Related Valuation Allowance	0	0
Average Annual Recorded Investment	2,736	2,302	$ 2,900
Interest Income Recognized While on Impaired Status	$ 58	$ 12