Loans (Summary of Impaired Loans by Classes of Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 29,505	$ 44,383	$ 25,100
Unpaid Principal Balance	29,968	45,151	25,375
Related Valuation Allowance	2,916	6,389	1,912
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	102,283	97,815	104,052
Unpaid Principal Balance	127,718	122,367	133,493
Related Valuation Allowance	0	0	0
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	131,788	142,198	129,152
Unpaid Principal Balance	157,686	167,518	158,868
Related Valuation Allowance	2,916	6,389	1,912
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	4,944	18,898	3,433
Unpaid Principal Balance	4,949	19,426	3,527
Related Valuation Allowance	1,926	5,700	1,119
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	35,353	31,039	33,733
Unpaid Principal Balance	45,042	37,703	39,382
Related Valuation Allowance	0	0	0
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	40,297	49,937	37,166
Unpaid Principal Balance	49,991	57,129	42,909
Related Valuation Allowance	1,926	5,700	1,119
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,558	4,448	1,780
Unpaid Principal Balance	4,016	4,688	1,961
Related Valuation Allowance	810	497	496
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	54,097	53,518	57,628
Unpaid Principal Balance	67,744	69,130	79,696
Related Valuation Allowance	0	0	0
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	57,655	57,966	59,408
Unpaid Principal Balance	71,760	73,818	81,657
Related Valuation Allowance	810	497	496
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,164	2,136	2,540
Unpaid Principal Balance	3,104	3,108	4,264
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,164	2,136	2,540
Unpaid Principal Balance	3,104	3,108	4,264
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	21,003	21,037	19,887
Unpaid Principal Balance	21,003	21,037	19,887
Related Valuation Allowance	180	192	297
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	6,939	7,638	7,382
Unpaid Principal Balance	7,793	8,644	7,382
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	27,942	28,675	27,269
Unpaid Principal Balance	28,796	29,681	27,269
Related Valuation Allowance	180	192	297
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	405	498	444
Unpaid Principal Balance	418	512	444
Related Valuation Allowance	0	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	405	498	444
Unpaid Principal Balance	418	512	444
Related Valuation Allowance	0	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,325	2,986	2,325
Unpaid Principal Balance	3,617	3,270	2,325
Related Valuation Allowance	0	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,325	2,986	2,325
Unpaid Principal Balance	3,617	3,270	2,325
Related Valuation Allowance	$ 0	$ 0	$ 0