Loans (Summary of the Aging Status of the Recorded Investment in Loans by Portfolio Segment/Class) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 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	$ 13,618	$ 20,595	$ 17,112
Financing receivable, recorded investment 61 to 89 days past due	3,940	3,352	3,432
Financing receivable, recorded investment accruing loans past due 90 days or more	1,779	2,073	1,535
Financing receivable, recorded investment, Nonaccrual loans	51,215	50,644	55,635
Financing receivable recorded investment, Total past due	70,552	76,664	77,714
Financing receivable, recorded investment, current	5,280,458	4,913,403	4,546,695
Financing receivable, recorded investment, Total loans	5,351,010	4,990,067	4,624,409
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	4,055	4,033	4,149
Financing receivable, recorded investment 61 to 89 days past due	2,317	743	1,901
Financing receivable, recorded investment accruing loans past due 90 days or more	711	170	15
Financing receivable, recorded investment, Nonaccrual loans	17,260	16,418	18,773
Financing receivable recorded investment, Total past due	24,343	21,364	24,838
Financing receivable, recorded investment, current	1,335,513	1,234,534	1,113,685
Financing receivable, recorded investment, Total loans	1,359,856	1,255,898	1,138,523
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	2,754	7,515	5,933
Financing receivable, recorded investment 61 to 89 days past due	1,117	1,383	233
Financing receivable, recorded investment accruing loans past due 90 days or more	56	0	69
Financing receivable, recorded investment, Nonaccrual loans	25,287	24,966	25,361
Financing receivable recorded investment, Total past due	29,214	33,864	31,596
Financing receivable, recorded investment, current	1,334,212	1,170,562	1,123,319
Financing receivable, recorded investment, Total loans	1,363,426	1,204,426	1,154,915
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	413	262	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	247	162	160
Financing receivable recorded investment, Total past due	660	424	160
Financing receivable, recorded investment, current	95,730	138,316	88,415
Financing receivable, recorded investment, Total loans	96,390	138,740	88,575
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	255	225	2,184
Financing receivable recorded investment, Total past due	255	225	2,184
Financing receivable, recorded investment, current	3,781	4,303	4,106
Financing receivable, recorded investment, Total loans	4,036	4,528	6,290
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	1,536	2,126	2,515
Financing receivable, recorded investment 61 to 89 days past due	0	54	0
Financing receivable, recorded investment accruing loans past due 90 days or more	424	557	376
Financing receivable, recorded investment, Nonaccrual loans	6,004	6,706	6,325
Financing receivable recorded investment, Total past due	7,964	9,443	9,216
Financing receivable, recorded investment, current	1,060,525	988,558	950,769
Financing receivable, recorded investment, Total loans	1,068,489	998,001	959,985
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	2,526	3,620	2,513
Financing receivable, recorded investment 61 to 89 days past due	302	512	313
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	393	500	536
Financing receivable recorded investment, Total past due	3,221	4,632	3,362
Financing receivable, recorded investment, current	868,715	814,746	740,295
Financing receivable, recorded investment, Total loans	871,936	819,378	743,657
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	2,334	3,039	2,002
Financing receivable, recorded investment 61 to 89 days past due	204	660	985
Financing receivable, recorded investment accruing loans past due 90 days or more	588	1,346	1,075
Financing receivable, recorded investment, Nonaccrual loans	1,769	1,667	2,296
Financing receivable recorded investment, Total past due	4,895	6,712	6,358
Financing receivable, recorded investment, current	581,982	562,384	526,106
Financing receivable, recorded investment, Total loans	586,877	569,096	532,464
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	3,889	2,994	345
Financing receivable, recorded investment 61 to 89 days past due	695	461	49
Financing receivable, recorded investment accruing loans past due 90 days or more	15,934	19,892	10,447
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	20,518	23,347	10,841
Financing receivable, recorded investment, current	1,663,215	674,816	263,554
Financing receivable, recorded investment, Total loans	1,683,733	698,163	274,395
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	690	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	3,781	5,427	6,744
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	4,471	5,560	6,744
Financing receivable, recorded investment, current	390,546	93,423	67,116
Financing receivable, recorded investment, Total loans	395,017	98,983	73,860
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	969	2,014	0
Financing receivable, recorded investment 61 to 89 days past due	291	352	0
Financing receivable, recorded investment accruing loans past due 90 days or more	6,603	11,052	1,594
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	7,863	13,418	1,594
Financing receivable, recorded investment, current	872,224	339,804	141,856
Financing receivable, recorded investment, Total loans	880,087	353,222	143,450
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	205	0	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	205	0	0
Financing receivable, recorded investment, current	5,122	14,005	12,593
Financing receivable, recorded investment, Total loans	5,327	14,005	12,593
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	1,352	1,653	1,977
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,352	1,653	1,977
Financing receivable, recorded investment, current	5,207	12,569	2,689
Financing receivable, recorded investment, Total loans	6,559	14,222	4,666
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	1,077	156	0
Financing receivable, recorded investment 61 to 89 days past due	138	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	2,980	18	69
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	4,195	174	69
Financing receivable, recorded investment, current	237,483	112,215	10,343
Financing receivable, recorded investment, Total loans	241,678	112,389	10,412
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	55	20
Financing receivable, recorded investment 61 to 89 days past due	56	3	0
Financing receivable, recorded investment accruing loans past due 90 days or more	5	454	0
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	61	512	20
Financing receivable, recorded investment, current	15,910	9,680	1,104
Financing receivable, recorded investment, Total loans	15,971	10,192	1,124
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	1,153	636	325
Financing receivable, recorded investment 61 to 89 days past due	210	106	49
Financing receivable, recorded investment accruing loans past due 90 days or more	1,008	1,288	63
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	2,371	2,030	437
Financing receivable, recorded investment, current	136,723	93,120	27,853
Financing receivable, recorded investment, Total loans	$ 139,094	$ 95,150	$ 28,290