Loans (Summary of Impaired Loans by Classes of Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 27,779	$ 44,383	$ 27,803
Unpaid Principal Balance	27,952	45,151	28,055
Related Valuation Allowance	3,217	6,389	1,581
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	94,607	97,815	103,066
Unpaid Principal Balance	116,472	122,367	132,985
Related Valuation Allowance	0	0	0
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	122,386	142,198	130,869
Unpaid Principal Balance	144,424	167,518	161,040
Related Valuation Allowance	3,217	6,389	1,581
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,764	18,898	4,044
Unpaid Principal Balance	3,769	19,426	4,137
Related Valuation Allowance	2,582	5,700	718
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	34,633	31,039	32,461
Unpaid Principal Balance	43,576	37,703	38,160
Related Valuation Allowance	0	0	0
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	38,397	49,937	36,505
Unpaid Principal Balance	47,345	57,129	42,297
Related Valuation Allowance	2,582	5,700	718
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,270	4,448	2,789
Unpaid Principal Balance	3,438	4,688	2,948
Related Valuation Allowance	472	497	603
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	47,894	53,518	56,052
Unpaid Principal Balance	58,312	69,130	78,490
Related Valuation Allowance	0	0	0
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	51,164	57,966	58,841
Unpaid Principal Balance	61,750	73,818	81,438
Related Valuation Allowance	472	497	603
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,196	2,136	2,393
Unpaid Principal Balance	3,770	3,108	4,175
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,196	2,136	2,393
Unpaid Principal Balance	3,770	3,108	4,175
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	20,745	21,037	20,970
Unpaid Principal Balance	20,745	21,037	20,970
Related Valuation Allowance	163	192	260
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	6,678	7,638	8,984
Unpaid Principal Balance	7,365	8,644	8,984
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	27,423	28,675	29,954
Unpaid Principal Balance	28,110	29,681	29,954
Related Valuation Allowance	163	192	260
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	347	498	398
Unpaid Principal Balance	365	512	398
Related Valuation Allowance	0	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	347	498	398
Unpaid Principal Balance	365	512	398
Related Valuation Allowance	0	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,859	2,986	2,778
Unpaid Principal Balance	3,084	3,270	2,778
Related Valuation Allowance	0	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,859	2,986	2,778
Unpaid Principal Balance	3,084	3,270	2,778
Related Valuation Allowance	$ 0	$ 0	$ 0