Loans (Summary of the Aging Status of the Recorded Investment in Loans by Portfolio Segment/Class) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Originated Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	$ 21,706	$ 17,045	$ 22,734
Financing receivable, recorded investment 61 to 89 days past due	10,061	3,679	4,331
Financing receivable, recorded investment accruing loans past due 90 days or more	1,659	2,359	2,098
Financing receivable, recorded investment, Nonaccrual loans	55,286	71,298	78,324
Financing receivable recorded investment, Total past due	88,712	94,381	107,487
Financing receivable, recorded investment, current	4,125,016	3,680,759	3,499,060
Financing receivable, recorded investment, Total loans	4,213,728	3,775,140	3,606,547
Originated Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	7,833	3,999	9,707
Financing receivable, recorded investment 61 to 89 days past due	1,542	730	1,374
Financing receivable, recorded investment accruing loans past due 90 days or more	281	0	273
Financing receivable, recorded investment, Nonaccrual loans	11,809	14,601	15,217
Financing receivable recorded investment, Total past due	21,465	19,330	26,571
Financing receivable, recorded investment, current	1,019,330	877,280	812,111
Financing receivable, recorded investment, Total loans	1,040,795	896,610	838,682
Originated Portfolio [Member] | Real estate commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	6,533	5,852	4,929
Financing receivable, recorded investment 61 to 89 days past due	2,274	2,089	1,660
Financing receivable, recorded investment accruing loans past due 90 days or more	0	87	247
Financing receivable, recorded investment, Nonaccrual loans	28,623	37,660	41,311
Financing receivable recorded investment, Total past due	37,430	45,688	48,147
Financing receivable, recorded investment, current	1,023,128	910,477	856,252
Financing receivable, recorded investment, Total loans	1,060,558	956,165	904,399
Originated Portfolio [Member] | Real estate construction [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	90	0	0
Financing receivable, recorded investment 61 to 89 days past due	5,385	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	183	1,217	933
Financing receivable recorded investment, Total past due	5,658	1,217	933
Financing receivable, recorded investment, current	60,130	47,906	37,364
Financing receivable, recorded investment, Total loans	65,788	49,123	38,297
Originated Portfolio [Member] | Land development [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	187	0	48
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	2,954	4,184	5,731
Financing receivable recorded investment, Total past due	3,141	4,184	5,779
Financing receivable, recorded investment, current	13,506	21,874	18,705
Financing receivable, recorded investment, Total loans	16,647	26,058	24,484
Originated Portfolio [Member] | Real estate residential [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	1,739	3,161	3,208
Financing receivable, recorded investment 61 to 89 days past due	76	55	97
Financing receivable, recorded investment accruing loans past due 90 days or more	692	1,503	431
Financing receivable, recorded investment, Nonaccrual loans	8,029	10,164	11,307
Financing receivable recorded investment, Total past due	10,536	14,883	15,043
Financing receivable, recorded investment, current	920,245	854,987	849,982
Financing receivable, recorded investment, Total loans	930,781	869,870	865,025
Originated Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	2,980	2,415	3,299
Financing receivable, recorded investment 61 to 89 days past due	350	378	470
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	665	739	876
Financing receivable recorded investment, Total past due	3,995	3,532	4,645
Financing receivable, recorded investment, current	616,016	540,546	531,594
Financing receivable, recorded investment, Total loans	620,011	544,078	536,239
Originated Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	2,344	1,618	1,543
Financing receivable, recorded investment 61 to 89 days past due	434	427	730
Financing receivable, recorded investment accruing loans past due 90 days or more	686	769	1,147
Financing receivable, recorded investment, Nonaccrual loans	3,023	2,733	2,949
Financing receivable recorded investment, Total past due	6,487	5,547	6,369
Financing receivable, recorded investment, current	472,661	427,689	393,052
Financing receivable, recorded investment, Total loans	479,148	433,236	399,421
Acquired Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	1,162	625	1,498
Financing receivable, recorded investment 61 to 89 days past due	80	15	54
Financing receivable, recorded investment accruing loans past due 90 days or more	7,610	9,099	9,391
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	8,852	9,739	10,943
Financing receivable, recorded investment, current	300,091	382,856	401,669
Financing receivable, recorded investment, Total loans	308,943	392,595	412,612
Acquired Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	67	0	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	15
Financing receivable, recorded investment accruing loans past due 90 days or more	1,574	2,834	3,356
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,641	2,834	3,371
Financing receivable, recorded investment, current	85,686	103,278	109,885
Financing receivable, recorded investment, Total loans	87,327	106,112	113,256
Acquired Portfolio [Member] | Real estate commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	439	287	1,262
Financing receivable, recorded investment 61 to 89 days past due	0	15	0
Financing receivable, recorded investment accruing loans past due 90 days or more	3,355	3,139	2,390
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	3,794	3,441	3,652
Financing receivable, recorded investment, current	151,279	202,255	209,022
Financing receivable, recorded investment, Total loans	155,073	205,696	212,674
Acquired Portfolio [Member] | Real estate construction [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	0	0	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	0	0	0
Financing receivable, recorded investment, current	12,573	13,566	17,774
Financing receivable, recorded investment, Total loans	12,573	13,566	17,774
Acquired Portfolio [Member] | Land development [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	0	0	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	2,422	2,834	3,038
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	2,422	2,834	3,038
Financing receivable, recorded investment, current	4,604	8,656	7,289
Financing receivable, recorded investment, Total loans	7,026	11,490	10,327
Acquired Portfolio [Member] | Real estate residential [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	264	123	80
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	77	122	343
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	341	245	423
Financing receivable, recorded investment, current	11,655	13,720	14,847
Financing receivable, recorded investment, Total loans	11,996	13,965	15,270
Acquired Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	3	10	18
Financing receivable, recorded investment 61 to 89 days past due	1	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	4	10	18
Financing receivable, recorded investment, current	2,025	1,948	2,155
Financing receivable, recorded investment, Total loans	2,029	1,958	2,173
Acquired Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	389	205	138
Financing receivable, recorded investment 61 to 89 days past due	79	0	39
Financing receivable, recorded investment accruing loans past due 90 days or more	182	170	264
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	650	375	441
Financing receivable, recorded investment, current	32,269	39,433	40,697
Financing receivable, recorded investment, Total loans	$ 32,919	$ 39,808	$ 41,138