Loans (Summary of the Aging Status of the Recorded Investment in Loans by Portfolio Segment/Class) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 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	$ 22,528	$ 17,045	$ 20,736
Financing receivable, recorded investment 61 to 89 days past due	7,000	3,679	3,536
Financing receivable, recorded investment accruing loans past due 90 days or more	932	2,359	2,566
Financing receivable, recorded investment, Nonaccrual loans	56,024	71,298	74,456
Financing receivable recorded investment, Total past due	86,484	94,381	101,294
Financing receivable, recorded investment, current	3,904,149	3,680,759	3,413,816
Financing receivable, recorded investment, Total loans	3,990,633	3,775,140	3,515,110
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	6,572	3,999	5,089
Financing receivable, recorded investment 61 to 89 days past due	2,251	730	1,838
Financing receivable, recorded investment accruing loans past due 90 days or more	1	0	300
Financing receivable, recorded investment, Nonaccrual loans	11,052	14,601	12,673
Financing receivable recorded investment, Total past due	19,876	19,330	19,900
Financing receivable, recorded investment, current	967,034	877,280	767,350
Financing receivable, recorded investment, Total loans	986,910	896,610	787,250
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	9,001	5,852	8,595
Financing receivable, recorded investment 61 to 89 days past due	3,974	2,089	556
Financing receivable, recorded investment accruing loans past due 90 days or more	78	87	269
Financing receivable, recorded investment, Nonaccrual loans	28,498	37,660	41,691
Financing receivable recorded investment, Total past due	41,551	45,688	51,111
Financing receivable, recorded investment, current	962,021	910,477	839,613
Financing receivable, recorded investment, Total loans	1,003,572	956,165	890,724
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	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	183	1,217	408
Financing receivable recorded investment, Total past due	183	1,217	408
Financing receivable, recorded investment, current	60,691	47,906	36,197
Financing receivable, recorded investment, Total loans	60,874	49,123	36,605
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	728
Financing receivable, recorded investment 61 to 89 days past due	0	0	187
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	3,434	4,184	3,077
Financing receivable recorded investment, Total past due	3,434	4,184	3,992
Financing receivable, recorded investment, current	15,500	21,874	24,476
Financing receivable, recorded investment, Total loans	18,934	26,058	28,468
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	2,871	3,161	2,568
Financing receivable, recorded investment 61 to 89 days past due	67	55	94
Financing receivable, recorded investment accruing loans past due 90 days or more	164	1,503	840
Financing receivable, recorded investment, Nonaccrual loans	9,241	10,164	12,613
Financing receivable recorded investment, Total past due	12,343	14,883	16,115
Financing receivable, recorded investment, current	873,851	854,987	840,900
Financing receivable, recorded investment, Total loans	886,194	869,870	857,015
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	2,564	2,415	2,743
Financing receivable, recorded investment 61 to 89 days past due	359	378	201
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	552	739	1,182
Financing receivable recorded investment, Total past due	3,475	3,532	4,126
Financing receivable, recorded investment, current	571,431	540,546	528,757
Financing receivable, recorded investment, Total loans	574,906	544,078	532,883
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	1,520	1,618	1,013
Financing receivable, recorded investment 61 to 89 days past due	349	427	660
Financing receivable, recorded investment accruing loans past due 90 days or more	689	769	1,157
Financing receivable, recorded investment, Nonaccrual loans	3,064	2,733	2,812
Financing receivable recorded investment, Total past due	5,622	5,547	5,642
Financing receivable, recorded investment, current	453,621	427,689	376,523
Financing receivable, recorded investment, Total loans	459,243	433,236	382,165
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	2,578	625	1,418
Financing receivable, recorded investment 61 to 89 days past due	78	15	0
Financing receivable, recorded investment accruing loans past due 90 days or more	8,400	9,099	13,555
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	11,056	9,739	14,973
Financing receivable, recorded investment, current	334,182	382,856	432,259
Financing receivable, recorded investment, Total loans	345,238	392,595	447,232
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	57
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	2,328	2,834	5,919
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	2,328	2,834	5,976
Financing receivable, recorded investment, current	102,656	103,278	122,126
Financing receivable, recorded investment, Total loans	104,984	106,112	128,102
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	287	1,016
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	3,389	3,139	3,291
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	3,389	3,441	4,307
Financing receivable, recorded investment, current	165,386	202,255	224,624
Financing receivable, recorded investment, Total loans	168,775	205,696	228,931
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	12,574	13,566	17,933
Financing receivable, recorded investment, Total loans	12,574	13,566	17,933
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	2,080	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	2,564	2,834	3,607
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	4,644	2,834	3,607
Financing receivable, recorded investment, current	3,603	8,656	7,614
Financing receivable, recorded investment, Total loans	8,247	11,490	11,221
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	198	123	75
Financing receivable, recorded investment 61 to 89 days past due	78	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	122	426
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	276	245	501
Financing receivable, recorded investment, current	12,346	13,720	15,698
Financing receivable, recorded investment, Total loans	12,622	13,965	16,199
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	12
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	3	10	12
Financing receivable, recorded investment, current	2,332	1,948	2,388
Financing receivable, recorded investment, Total loans	2,335	1,958	2,400
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	297	205	258
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	119	170	312
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	416	375	570
Financing receivable, recorded investment, current	35,285	39,433	41,876
Financing receivable, recorded investment, Total loans	$ 35,701	$ 39,808	$ 42,446