Loans (Summary of the Aging Status of the Recorded Investment in Loans by Portfolio Segment/Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
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	$ 19,616	$ 20,595	$ 15,749
Financing receivable, recorded investment 61 to 89 days past due	2,851	3,352	1,972
Financing receivable, recorded investment accruing loans past due 90 days or more	1,468	2,073	2,262
Financing receivable, recorded investment, Nonaccrual loans	60,636	50,644	53,036
Financing receivable recorded investment, Total past due	84,571	76,664	73,019
Financing receivable, recorded investment, current	5,582,588	4,913,403	4,704,595
Financing receivable, recorded investment, Total loans	5,667,159	4,990,067	4,777,614
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	4,580	4,033	3,717
Financing receivable, recorded investment 61 to 89 days past due	1,297	743	1,145
Financing receivable, recorded investment accruing loans past due 90 days or more	122	170	16
Financing receivable, recorded investment, Nonaccrual loans	26,463	16,418	18,213
Financing receivable recorded investment, Total past due	32,462	21,364	23,091
Financing receivable, recorded investment, current	1,432,778	1,234,534	1,144,885
Financing receivable, recorded investment, Total loans	1,465,240	1,255,898	1,167,976
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	7,716	7,515	3,837
Financing receivable, recorded investment 61 to 89 days past due	344	1,383	29
Financing receivable, recorded investment accruing loans past due 90 days or more	216	0	87
Financing receivable, recorded investment, Nonaccrual loans	24,969	24,966	23,858
Financing receivable recorded investment, Total past due	33,245	33,864	27,811
Financing receivable, recorded investment, current	1,395,543	1,170,562	1,155,665
Financing receivable, recorded investment, Total loans	1,428,788	1,204,426	1,183,476
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	262	1,075
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	247	162	162
Financing receivable recorded investment, Total past due	247	424	1,237
Financing receivable, recorded investment, current	127,573	138,316	113,744
Financing receivable, recorded investment, Total loans	127,820	138,740	114,981
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	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	297	225	1,467
Financing receivable recorded investment, Total past due	297	225	1,467
Financing receivable, recorded investment, current	7,534	4,303	4,789
Financing receivable, recorded investment, Total loans	7,831	4,528	6,256
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	1,818	2,126	1,669
Financing receivable, recorded investment 61 to 89 days past due	85	54	0
Financing receivable, recorded investment accruing loans past due 90 days or more	572	557	380
Financing receivable, recorded investment, Nonaccrual loans	6,248	6,706	6,693
Financing receivable recorded investment, Total past due	8,723	9,443	8,742
Financing receivable, recorded investment, current	1,152,387	988,558	965,447
Financing receivable, recorded investment, Total loans	1,161,110	998,001	974,189
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	3,075	3,620	2,859
Financing receivable, recorded investment 61 to 89 days past due	375	512	437
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	536	500	527
Financing receivable recorded investment, Total past due	3,986	4,632	3,823
Financing receivable, recorded investment, current	883,471	814,746	778,791
Financing receivable, recorded investment, Total loans	887,457	819,378	782,614
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	2,427	3,039	2,592
Financing receivable, recorded investment 61 to 89 days past due	750	660	361
Financing receivable, recorded investment accruing loans past due 90 days or more	558	1,346	1,779
Financing receivable, recorded investment, Nonaccrual loans	1,876	1,667	2,116
Financing receivable recorded investment, Total past due	5,611	6,712	6,848
Financing receivable, recorded investment, current	583,302	562,384	541,274
Financing receivable, recorded investment, Total loans	588,913	569,096	548,122
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	2,544	2,994	335
Financing receivable, recorded investment 61 to 89 days past due	1,100	461	0
Financing receivable, recorded investment accruing loans past due 90 days or more	17,644	19,892	10,229
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	21,288	23,347	10,564
Financing receivable, recorded investment, current	1,527,748	674,816	252,742
Financing receivable, recorded investment, Total loans	1,549,036	698,163	263,306
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	209	133	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	6,273	5,427	6,514
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	6,482	5,560	6,514
Financing receivable, recorded investment, current	358,148	93,423	65,456
Financing receivable, recorded investment, Total loans	364,630	98,983	71,970
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	722	2,014	0
Financing receivable, recorded investment 61 to 89 days past due	760	352	0
Financing receivable, recorded investment accruing loans past due 90 days or more	5,783	11,052	1,559
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	7,265	13,418	1,559
Financing receivable, recorded investment, current	791,311	339,804	137,611
Financing receivable, recorded investment, Total loans	798,576	353,222	139,170
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	153	0	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	153	0	0
Financing receivable, recorded investment, current	5,432	14,005	10,801
Financing receivable, recorded investment, Total loans	5,585	14,005	10,801
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	725	1,653	1,727
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	725	1,653	1,727
Financing receivable, recorded investment, current	3,620	12,569	2,451
Financing receivable, recorded investment, Total loans	4,345	14,222	4,178
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	908	156	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	3,387	18	202
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	4,295	174	202
Financing receivable, recorded investment, current	229,022	112,215	9,658
Financing receivable, recorded investment, Total loans	233,317	112,389	9,860
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	30	55	0
Financing receivable, recorded investment 61 to 89 days past due	0	3	0
Financing receivable, recorded investment accruing loans past due 90 days or more	67	454	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	97	512	0
Financing receivable, recorded investment, current	12,197	9,680	829
Financing receivable, recorded investment, Total loans	12,294	10,192	829
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	675	636	335
Financing receivable, recorded investment 61 to 89 days past due	340	106	0
Financing receivable, recorded investment accruing loans past due 90 days or more	1,256	1,288	227
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	2,271	2,030	562
Financing receivable, recorded investment, current	128,018	93,120	25,936
Financing receivable, recorded investment, Total loans	$ 130,289	$ 95,150	$ 26,498