Allowance For Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Allowance for loan losses:
Beginning balance	$ 47,420	$ 18,292	$ 32,947	$ 15,605	$ 15,605
Provision	28,200	3,054	55,200	5,364	17,864
Charge-offs	(39,825)	(1,034)	(53,281)	(2,455)	(2,856)
Recoveries	116	412	1,045	2,210	2,334
Ending balance	35,911	20,724	35,911	20,724	32,947
Loans evaluated for impairment:
Collectively evaluated for impairment						$ 2,914,666	$ 3,039,502	$ 1,942,442
Individually evaluated for impairment						98,830	44,993	30,433
Purchased credit impaired						34,122	46,174	9,405
Total loans held for investment						3,047,618	3,130,669	1,982,280
Allowance for loans losses evaluated:
Collectively evaluated for impairment						22,495	17,898	17,782
Individually evaluated for impairment						11,584	14,840	2,743
Purchased credit impaired						1,832	209	199
Total allowance for loan losses	47,420	18,292	32,947	15,605	15,605	35,911	32,947	20,724
Commercial & Industrial [Member]
Loans evaluated for impairment:
Total loans held for investment						1,004,414	1,206,452
Owner occupied commercial real estate [Member]
Loans evaluated for impairment:
Total loans held for investment						387,032	353,889
Commercial real estate [Member]
Loans evaluated for impairment:
Total loans held for investment						1,109,642	904,115
Construction, land & land development [Member]
Loans evaluated for impairment:
Total loans held for investment						278,323	358,813
Residential mortgage [Member]
Loans evaluated for impairment:
Total loans held for investment						256,840	293,483
Consumer and other [Member]
Loans evaluated for impairment:
Total loans held for investment						11,367	13,917
Originated [Member]
Allowance for loan losses:
Beginning balance	44,201	18,027	32,723	15,414	15,414
Provision	22,844	2,815	46,533	4,368	16,625
Charge-offs	(36,410)	(695)	(49,323)	(1,389)	(1,499)
Recoveries	41	361	743	2,115	2,183
Ending balance	30,676	20,508	30,676	20,508	32,723
Loans evaluated for impairment:
Collectively evaluated for impairment						2,085,991	1,892,160	1,781,990
Individually evaluated for impairment						66,068	41,397	27,645
Total loans held for investment						2,152,059	1,933,557	1,809,635
Allowance for loans losses evaluated:
Collectively evaluated for impairment						21,778	17,883	17,767
Individually evaluated for impairment						8,898	14,840	2,741
Total allowance for loan losses	44,201	18,027	32,723	15,414	15,414	30,676	32,723	20,508
Originated [Member] | Commercial & Industrial [Member]
Allowance for loan losses:
Beginning balance	30,880	8,426	23,084	8,139	8,139
Provision	22,308	3,075	42,286	2,201	14,164
Charge-offs	(36,330)	(693)	(49,201)	(1,277)	(1,311)
Recoveries	13	285	702	2,030	2,092
Ending balance	16,871	11,093	16,871	11,093	23,084
Loans evaluated for impairment:
Collectively evaluated for impairment						766,494	815,679	782,058
Individually evaluated for impairment						56,553	34,369	20,545
Total loans held for investment						823,047	850,048	802,603
Allowance for loans losses evaluated:
Collectively evaluated for impairment						8,106	8,351	8,465
Individually evaluated for impairment						8,765	14,733	2,628
Total allowance for loan losses	30,880	8,426	23,084	8,139	8,139	16,871	23,084	11,093
Originated [Member] | Owner occupied commercial real estate [Member]
Allowance for loan losses:
Beginning balance	2,124	1,436	1,675	969	969
Provision	278	204	727	671	706
Ending balance	2,402	1,640	2,402	1,640	1,675
Loans evaluated for impairment:
Collectively evaluated for impairment						248,373	188,079	168,443
Individually evaluated for impairment						1,454	829	853
Total loans held for investment						249,827	188,908	169,296
Allowance for loans losses evaluated:
Collectively evaluated for impairment						2,402	1,675	1,640
Total allowance for loan losses	2,124	1,436	1,675	969	969	2,402	1,675	1,640
Originated [Member] | Commercial real estate [Member]
Allowance for loan losses:
Beginning balance	7,540	4,125	4,525	2,777	2,777
Provision	669	(123)	3,684	1,225	1,673
Charge-offs	(26)		(26)
Recoveries		75		75	75
Ending balance	8,183	4,077	8,183	4,077	4,525
Loans evaluated for impairment:
Collectively evaluated for impairment						754,527	516,531	460,571
Individually evaluated for impairment						7,261	5,356	5,418
Total loans held for investment						761,788	521,887	465,989
Allowance for loans losses evaluated:
Collectively evaluated for impairment						8,183	4,525	4,077
Total allowance for loan losses	7,540	4,125	4,525	2,777	2,777	8,183	4,525	4,077
Originated [Member] | Construction, land & land development [Member]
Allowance for loan losses:
Beginning balance	2,426	2,826	2,337	2,621	2,621
Provision	(588)	(380)	(499)	(175)	(284)
Ending balance	1,838	2,446	1,838	2,446	2,337
Loans evaluated for impairment:
Collectively evaluated for impairment						180,315	242,139	246,742
Individually evaluated for impairment							472	486
Total loans held for investment						180,315	242,611	247,228
Allowance for loans losses evaluated:
Collectively evaluated for impairment						1,838	2,245	2,348
Individually evaluated for impairment							92	98
Total allowance for loan losses	2,426	2,826	2,337	2,621	2,621	1,838	2,337	2,446
Originated [Member] | Residential mortgage [Member]
Allowance for loan losses:
Beginning balance	1,172	845	816	644	644
Provision	(4)	99	349	300	235
Charge-offs					(63)
Recoveries	23		26
Ending balance	1,191	944	1,191	944	816
Loans evaluated for impairment:
Collectively evaluated for impairment						127,498	120,063	114,535
Individually evaluated for impairment						579	197	198
Total loans held for investment						128,077	120,260	114,733
Allowance for loans losses evaluated:
Collectively evaluated for impairment						1,177	801	929
Individually evaluated for impairment						14	15	15
Total allowance for loan losses	1,172	845	816	644	644	1,191	816	944
Originated [Member] | Consumer and other [Member]
Allowance for loan losses:
Beginning balance	59	369	286	264	264
Provision	181	(60)	(14)	146	131
Charge-offs	(54)	(2)	(96)	(112)	(125)
Recoveries	5	1	15	10	16
Ending balance	191	308	191	308	286
Loans evaluated for impairment:
Collectively evaluated for impairment						8,784	9,669	9,641
Individually evaluated for impairment						221	174	145
Total loans held for investment						9,005	9,843	9,786
Allowance for loans losses evaluated:
Collectively evaluated for impairment						72	286	308
Individually evaluated for impairment						119
Total allowance for loan losses	59	369	286	264	264	191	286	308
Acquired [Member]
Allowance for loan losses:
Beginning balance	3,219	265	224	191	191
Provision	5,356	239	8,667	996	1,239
Charge-offs	(3,415)	(339)	(3,958)	(1,066)	(1,357)
Recoveries	75	51	302	95	151
Ending balance	5,235	216	5,235	216	224
Loans evaluated for impairment:
Collectively evaluated for impairment						828,675	1,147,342	160,452
Individually evaluated for impairment						32,762	3,596	2,788
Purchased credit impaired						34,122	46,174	9,405
Total loans held for investment						895,559	1,197,112	172,645
Allowance for loans losses evaluated:
Collectively evaluated for impairment						717	15	15
Individually evaluated for impairment						2,686		2
Purchased credit impaired						1,832	209	199
Total allowance for loan losses	3,219	265	224	191	191	5,235	224	216
Acquired [Member] | Commercial & Industrial [Member]
Allowance for loan losses:
Beginning balance	410	37	46	6	6
Provision	3,719	240	4,360	976	1,283
Charge-offs	(1,459)	(288)	(1,804)	(1,008)	(1,336)
Recoveries	24	46	92	61	93
Ending balance	2,694	35	2,694	35	46
Loans evaluated for impairment:
Collectively evaluated for impairment						150,937	341,785	16,162
Individually evaluated for impairment						25,652	714	672
Purchased credit impaired						4,778	13,905	900
Total loans held for investment						181,367	356,404	17,734
Allowance for loans losses evaluated:
Collectively evaluated for impairment							1	1
Individually evaluated for impairment						2,684
Purchased credit impaired						10	45	34
Total allowance for loan losses	410	37	46	6	6	2,694	46	35
Acquired [Member] | Owner occupied commercial real estate [Member]
Allowance for loan losses:
Beginning balance	580	5	4	5	5
Provision	383		1,137		(1)
Charge-offs	(977)		(1,155)
Recoveries	17		17
Ending balance	3	5	3	5	4
Loans evaluated for impairment:
Collectively evaluated for impairment						128,633	157,832	12,905
Individually evaluated for impairment						2,583
Purchased credit impaired						5,989	7,149	1,023
Total loans held for investment						137,205	164,981	13,928
Allowance for loans losses evaluated:
Collectively evaluated for impairment							2	2
Purchased credit impaired						3	2	3
Total allowance for loan losses	580	5	4	5	5	3	4	5
Acquired [Member] | Commercial real estate [Member]
Allowance for loan losses:
Beginning balance	25	166	166	165	165
Provision	466		325		(1)
Charge-offs	(466)		(466)
Recoveries				1	2
Ending balance	25	166	25	166	166
Loans evaluated for impairment:
Collectively evaluated for impairment						333,271	368,350	11,525
Individually evaluated for impairment						2,623	1,590	1,640
Purchased credit impaired						11,960	12,288	4,474
Total loans held for investment						347,854	382,228	17,639
Allowance for loans losses evaluated:
Collectively evaluated for impairment							12	12
Purchased credit impaired						25	154	154
Total allowance for loan losses	25	166	166	165	165	25	166	166
Acquired [Member] | Construction, land & land development [Member]
Allowance for loan losses:
Beginning balance	825	9	8	12	12
Provision	671	(1)	1,415	(4)	(9)
Recoveries	6		79		5
Ending balance	1,502	8	1,502	8	8
Loans evaluated for impairment:
Collectively evaluated for impairment						89,319	107,521	4,933
Individually evaluated for impairment						358
Purchased credit impaired						8,331	8,681	45
Total loans held for investment						98,008	116,202	4,978
Allowance for loans losses evaluated:
Collectively evaluated for impairment						3
Purchased credit impaired						1,499	8	8
Total allowance for loan losses	825	9	8	12	12	1,502	8	8
Acquired [Member] | Residential mortgage [Member]
Allowance for loan losses:
Beginning balance	1,368	45		1	1
Provision	122	(6)	1,422	20	(37)
Charge-offs	(512)	(41)	(518)	(41)
Recoveries	22	4	96	22	36
Ending balance	1,000	2	1,000	2
Loans evaluated for impairment:
Collectively evaluated for impairment						124,165	167,780	112,624
Individually evaluated for impairment						1,534	1,292	476
Purchased credit impaired						3,064	4,151	2,963
Total loans held for investment						128,763	173,223	116,063
Allowance for loans losses evaluated:
Collectively evaluated for impairment						705
Individually evaluated for impairment								2
Purchased credit impaired						295
Total allowance for loan losses	1,368	45	1,000	1	1	1,000		2
Acquired [Member] | Consumer and other [Member]
Allowance for loan losses:
Beginning balance	11	3		2	2
Provision	(5)	6	8	4	4
Charge-offs	(1)	(10)	(15)	(17)	(21)
Recoveries	6	1	18	11	15
Ending balance	11		11
Loans evaluated for impairment:
Collectively evaluated for impairment						2,350	4,074	2,303
Individually evaluated for impairment						12
Total loans held for investment						2,362	$ 4,074	$ 2,303
Allowance for loans losses evaluated:
Collectively evaluated for impairment						9
Individually evaluated for impairment						2
Total allowance for loan losses	$ 11	$ 3	$ 11	$ 2	$ 2	$ 11