Loans (Summary of the Aging Status of the Recorded Investment in Loans by Portfolio Segment/Class) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Originated Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	$ 41,297	$ 62,225
Financing receivable recorded investment, Total past due	78,866	83,279
Financing receivable, recorded investment, current	6,677,065	5,724,655
Financing receivable, recorded investment, Total loans	6,755,931	5,807,934
Originated Portfolio [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	29,378	14,502
Originated Portfolio [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	4,789	4,265
Originated Portfolio [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	3,402	2,287
Originated Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	13,742	28,554
Financing receivable recorded investment, Total past due	22,951	33,833
Financing receivable, recorded investment, current	1,701,280	1,487,682
Financing receivable, recorded investment, Total loans	1,724,231	1,521,515
Originated Portfolio [Member] | Commercial [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	6,313	3,685
Originated Portfolio [Member] | Commercial [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	2,675	1,230
Originated Portfolio [Member] | Commercial [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	221	364
Originated Portfolio [Member] | Commercial real estate [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	19,914	25,163
Financing receivable recorded investment, Total past due	33,292	31,188
Financing receivable, recorded investment, current	1,570,477	1,392,871
Financing receivable, recorded investment, Total loans	1,603,769	1,424,059
Originated Portfolio [Member] | Commercial real estate [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	11,913	4,168
Originated Portfolio [Member] | Commercial real estate [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	726	1,603
Originated Portfolio [Member] | Commercial real estate [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	739	254
Originated Portfolio [Member] | Real estate construction and land development [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	80	521
Financing receivable recorded investment, Total past due	4,522	521
Financing receivable, recorded investment, current	288,202	184,626
Financing receivable, recorded investment, Total loans	292,724	185,147
Originated Portfolio [Member] | Real estate construction and land development [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	3,003	0
Originated Portfolio [Member] | Real estate construction and land development [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	0	0
Originated Portfolio [Member] | Real estate construction and land development [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	1,439	0
Originated Portfolio [Member] | Residential mortgage [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	5,119	5,557
Financing receivable recorded investment, Total past due	8,121	7,696
Financing receivable, recorded investment, current	1,362,883	1,209,279
Financing receivable, recorded investment, Total loans	1,371,004	1,216,975
Originated Portfolio [Member] | Residential mortgage [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	2,627	1,737
Originated Portfolio [Member] | Residential mortgage [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	0	0
Originated Portfolio [Member] | Residential mortgage [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	375	402
Originated Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	378	451
Financing receivable recorded investment, Total past due	3,251	4,240
Financing receivable, recorded investment, current	1,168,886	865,186
Financing receivable, recorded investment, Total loans	1,172,137	869,426
Originated Portfolio [Member] | Consumer installment [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	2,425	3,145
Originated Portfolio [Member] | Consumer installment [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	448	644
Originated Portfolio [Member] | Consumer installment [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	0	0
Originated Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	2,064	1,979
Financing receivable recorded investment, Total past due	6,729	5,801
Financing receivable, recorded investment, current	585,337	585,011
Financing receivable, recorded investment, Total loans	592,066	590,812
Originated Portfolio [Member] | Home equity [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	3,097	1,767
Originated Portfolio [Member] | Home equity [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	940	788
Originated Portfolio [Member] | Home equity [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	628	1,267
Acquired Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	0	0
Financing receivable recorded investment, Total past due	72,634	20,415
Financing receivable, recorded investment, current	5,887,224	1,442,798
Financing receivable, recorded investment, Total loans	5,959,858	1,463,213
Acquired Portfolio [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	11,540	6,319
Acquired Portfolio [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	8,381	1,301
Acquired Portfolio [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	52,713	12,795
Acquired Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	0	0
Financing receivable recorded investment, Total past due	16,246	4,757
Financing receivable, recorded investment, current	1,419,459	379,607
Financing receivable, recorded investment, Total loans	1,435,705	384,364
Acquired Portfolio [Member] | Commercial [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	3,116	490
Acquired Portfolio [Member] | Commercial [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	1,146	532
Acquired Portfolio [Member] | Commercial [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	11,984	3,735
Acquired Portfolio [Member] | Commercial real estate [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	0	0
Financing receivable recorded investment, Total past due	32,603	9,019
Financing receivable, recorded investment, current	2,136,645	679,084
Financing receivable, recorded investment, Total loans	2,169,248	688,103
Acquired Portfolio [Member] | Commercial real estate [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	4,315	3,557
Acquired Portfolio [Member] | Commercial real estate [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	2,844	691
Acquired Portfolio [Member] | Commercial real estate [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	25,444	4,771
Acquired Portfolio [Member] | Real estate construction and land development [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	0	0
Financing receivable recorded investment, Total past due	3,263	1,154
Financing receivable, recorded investment, current	204,507	45,775
Financing receivable, recorded investment, Total loans	207,770	46,929
Acquired Portfolio [Member] | Real estate construction and land development [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	208	0
Acquired Portfolio [Member] | Real estate construction and land development [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	153	0
Acquired Portfolio [Member] | Real estate construction and land development [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	2,902	1,154
Acquired Portfolio [Member] | Residential mortgage [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	0	0
Financing receivable recorded investment, Total past due	15,066	3,451
Financing receivable, recorded investment, current	1,660,889	209,210
Financing receivable, recorded investment, Total loans	1,675,955	212,661
Acquired Portfolio [Member] | Residential mortgage [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	1,452	1,370
Acquired Portfolio [Member] | Residential mortgage [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	2,895	0
Acquired Portfolio [Member] | Residential mortgage [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	10,719	2,081
Acquired Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	0	0
Financing receivable recorded investment, Total past due	1,770	102
Financing receivable, recorded investment, current	161,800	7,929
Financing receivable, recorded investment, Total loans	163,570	8,031
Acquired Portfolio [Member] | Consumer installment [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	1,367	55
Acquired Portfolio [Member] | Consumer installment [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	200	0
Acquired Portfolio [Member] | Consumer installment [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	203	47
Acquired Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Nonaccrual loans	0	0
Financing receivable recorded investment, Total past due	3,686	1,932
Financing receivable, recorded investment, current	303,924	121,193
Financing receivable, recorded investment, Total loans	307,610	123,125
Acquired Portfolio [Member] | Home equity [Member] | 31-60 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	1,082	847
Acquired Portfolio [Member] | Home equity [Member] | 61-89 Days Past Due [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	1,143	78
Acquired Portfolio [Member] | Home equity [Member] | Accruing Loans Past Due 90 Days or More [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment, Loans past due	$ 1,461	$ 1,007