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, 2014	Dec. 31, 2013	Sep. 30, 2013
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	$ 15,749	$ 19,581	$ 21,706
Financing receivable, recorded investment 61 to 89 days past due	1,972	7,316	10,061
Financing receivable, recorded investment accruing loans past due 90 days or more	2,262	1,997	1,659
Financing receivable, recorded investment, Nonaccrual loans	53,036	61,897	55,286
Financing receivable recorded investment, Total past due	73,019	90,791	88,712
Financing receivable, recorded investment, current	4,704,595	4,262,133	4,125,016
Financing receivable, recorded investment, Total loans	4,777,614	4,352,924	4,213,728
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	3,717	4,748	7,833
Financing receivable, recorded investment 61 to 89 days past due	1,145	865	1,542
Financing receivable, recorded investment accruing loans past due 90 days or more	16	536	281
Financing receivable, recorded investment, Nonaccrual loans	18,213	18,374	11,809
Financing receivable recorded investment, Total past due	23,091	24,523	21,465
Financing receivable, recorded investment, current	1,144,885	1,068,170	1,019,330
Financing receivable, recorded investment, Total loans	1,167,976	1,092,693	1,040,795
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	3,837	8,560	6,533
Financing receivable, recorded investment 61 to 89 days past due	29	1,604	2,274
Financing receivable, recorded investment accruing loans past due 90 days or more	87	190	0
Financing receivable, recorded investment, Nonaccrual loans	23,858	28,598	28,623
Financing receivable recorded investment, Total past due	27,811	38,952	37,430
Financing receivable, recorded investment, current	1,155,665	1,046,235	1,023,128
Financing receivable, recorded investment, Total loans	1,183,476	1,085,187	1,060,558
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	1,075	0	90
Financing receivable, recorded investment 61 to 89 days past due	0	4,107	5,385
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	162	371	183
Financing receivable recorded investment, Total past due	1,237	4,478	5,658
Financing receivable, recorded investment, current	113,744	72,981	60,130
Financing receivable, recorded investment, Total loans	114,981	77,459	65,788
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	0	0	187
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	1,467	2,309	2,954
Financing receivable recorded investment, Total past due	1,467	2,309	3,141
Financing receivable, recorded investment, current	4,789	10,971	13,506
Financing receivable, recorded investment, Total loans	6,256	13,280	16,647
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	1,669	2,191	1,739
Financing receivable, recorded investment 61 to 89 days past due	0	103	76
Financing receivable, recorded investment accruing loans past due 90 days or more	380	537	692
Financing receivable, recorded investment, Nonaccrual loans	6,693	8,921	8,029
Financing receivable recorded investment, Total past due	8,742	11,752	10,536
Financing receivable, recorded investment, current	965,447	937,129	920,245
Financing receivable, recorded investment, Total loans	974,189	948,881	930,781
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	2,859	2,630	2,980
Financing receivable, recorded investment 61 to 89 days past due	437	359	350
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	527	676	665
Financing receivable recorded investment, Total past due	3,823	3,665	3,995
Financing receivable, recorded investment, current	778,791	639,381	616,016
Financing receivable, recorded investment, Total loans	782,614	643,046	620,011
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	2,592	1,452	2,344
Financing receivable, recorded investment 61 to 89 days past due	361	278	434
Financing receivable, recorded investment accruing loans past due 90 days or more	1,779	734	686
Financing receivable, recorded investment, Nonaccrual loans	2,116	2,648	3,023
Financing receivable recorded investment, Total past due	6,848	5,112	6,487
Financing receivable, recorded investment, current	541,274	487,266	472,661
Financing receivable, recorded investment, Total loans	548,122	492,378	479,148
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	335	397	1,162
Financing receivable, recorded investment 61 to 89 days past due	0	184	80
Financing receivable, recorded investment accruing loans past due 90 days or more	10,229	9,787	7,610
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	10,564	10,368	8,852
Financing receivable, recorded investment, current	252,742	284,329	300,091
Financing receivable, recorded investment, Total loans	263,306	294,697	308,943
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	0	0	67
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	6,514	5,656	1,574
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	6,514	5,656	1,641
Financing receivable, recorded investment, current	65,456	77,958	85,686
Financing receivable, recorded investment, Total loans	71,970	83,614	87,327
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	0	0	439
Financing receivable, recorded investment 61 to 89 days past due	0	133	0
Financing receivable, recorded investment accruing loans past due 90 days or more	1,559	1,695	3,355
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,559	1,828	3,794
Financing receivable, recorded investment, current	137,611	145,643	151,279
Financing receivable, recorded investment, Total loans	139,170	147,471	155,073
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	10,801	12,336	12,573
Financing receivable, recorded investment, Total loans	10,801	12,336	12,573
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	1,727	2,332	2,422
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,727	2,332	2,422
Financing receivable, recorded investment, current	2,451	4,454	4,604
Financing receivable, recorded investment, Total loans	4,178	6,786	7,026
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	0	0	264
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	202	61	77
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	202	61	341
Financing receivable, recorded investment, current	9,658	11,481	11,655
Financing receivable, recorded investment, Total loans	9,860	11,542	11,996
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	0	3	3
Financing receivable, recorded investment 61 to 89 days past due	0	51	1
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	54	4
Financing receivable, recorded investment, current	829	1,669	2,025
Financing receivable, recorded investment, Total loans	829	1,723	2,029
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	335	394	389
Financing receivable, recorded investment 61 to 89 days past due	0	0	79
Financing receivable, recorded investment accruing loans past due 90 days or more	227	43	182
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	562	437	650
Financing receivable, recorded investment, current	25,936	30,788	32,269
Financing receivable, recorded investment, Total loans	$ 26,498	$ 31,225	$ 32,919