Loans (Summary of Impaired Loans by Classes of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	$ 32,836	$ 42,961	$ 43,245
Unpaid Principal Balance	36,058	43,751	45,956
Related Valuation Allowance	4,434	8,108	8,138
Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	86,631	86,002	86,938
Unpaid Principal Balance	107,050	106,354	107,352
Related Valuation Allowance	0	0	0
Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	119,467	128,963	130,183
Unpaid Principal Balance	143,108	150,105	153,308
Related Valuation Allowance	4,434	8,108	8,138
Commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	4,569	6,368	4,112
Unpaid Principal Balance	5,618	6,818	4,813
Related Valuation Allowance	1,610	1,966	1,423
Commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	21,969	23,230	23,690
Unpaid Principal Balance	25,934	27,959	28,827
Related Valuation Allowance	0	0	0
Commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	26,538	29,598	27,802
Unpaid Principal Balance	31,552	34,777	33,640
Related Valuation Allowance	1,610	1,966	1,423
Real estate commercial [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	8,822	17,267	19,581
Unpaid Principal Balance	10,162	17,607	21,555
Related Valuation Allowance	2,112	5,359	5,750
Real estate commercial [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	42,913	37,223	38,947
Unpaid Principal Balance	56,117	48,531	51,008
Related Valuation Allowance	0	0	0
Real estate commercial [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	51,735	54,490	58,528
Unpaid Principal Balance	66,279	66,138	72,563
Related Valuation Allowance	2,112	5,359	5,750
Real estate construction [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	0	171	181
Unpaid Principal Balance	0	171	181
Related Valuation Allowance	0	75	134
Real estate construction [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	397	1,046	227
Unpaid Principal Balance	467	1,116	1,394
Related Valuation Allowance	0	0	0
Real estate construction [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	397	1,217	408
Unpaid Principal Balance	467	1,287	1,575
Related Valuation Allowance	0	75	134
Land development [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	2,039	254	972
Unpaid Principal Balance	2,872	254	1,008
Related Valuation Allowance	130	50	154
Land development [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	8,495	10,867	7,467
Unpaid Principal Balance	11,675	15,112	9,516
Related Valuation Allowance	0	0	0
Land development [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	10,534	11,121	8,439
Unpaid Principal Balance	14,547	15,366	10,524
Related Valuation Allowance	130	50	154
Real estate residential [Member] | Impaired loans with a valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	17,406	18,901	18,399
Unpaid Principal Balance	17,406	18,901	18,399
Related Valuation Allowance	582	658	677
Real estate residential [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	9,241	10,164	12,613
Unpaid Principal Balance	9,241	10,164	12,613
Related Valuation Allowance	0	0	0
Real estate residential [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	26,647	29,065	31,012
Unpaid Principal Balance	26,647	29,065	31,012
Related Valuation Allowance	582	658	677
Consumer installment [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	552	739	1,182
Unpaid Principal Balance	552	739	1,182
Related Valuation Allowance	0	0	0
Consumer installment [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	552	739	1,182
Unpaid Principal Balance	552	739	1,182
Related Valuation Allowance	0	0	0
Home equity [Member] | Impaired loans with no valuation allowance [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,064	2,733	2,812
Unpaid Principal Balance	3,064	2,733	2,812
Related Valuation Allowance	0	0	0
Home equity [Member] | Total Impaired Loans [Member]
Schedule of Impaired loans by classes
Recorded Investment	3,064	2,733	2,812
Unpaid Principal Balance	3,064	2,733	2,812
Related Valuation Allowance	$ 0	$ 0	$ 0