Allowance For Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Allowance for loan losses:
Beginning balance	$ 31,936	$ 39,714	$ 26,364	$ 32,947	$ 32,947
Provision	1,510	11,000	7,655	27,000	64,700
Charge-offs	(1,553)	(3,550)	(2,968)	(13,456)	(72,585)
Recoveries	98	256	940	929	1,302
Ending balance	31,991	47,420	31,991	47,420	26,364
Loans evaluated for impairment:
Collectively evaluated for impairment						$ 3,032,593	$ 2,979,708	$ 3,077,160
Individually evaluated for impairment						70,256	93,324	72,950
Purchased credit impaired						20,506	25,188	39,326
Total loans held for investment						3,123,355	3,098,220	3,189,436
Allowance for loans losses evaluated:
Collectively evaluated for impairment						24,506	24,467	25,866
Individually evaluated for impairment						7,468	1,775	20,122
Purchased credit impaired						17	122	1,432
Total allowance for loan losses	31,936	39,714	26,364	32,947	32,947	31,991	26,364	47,420
Commercial & Industrial
Loans evaluated for impairment:
Total loans held for investment						1,144,332	1,053,925
Owner occupied commercial real estate
Loans evaluated for impairment:
Total loans held for investment						407,317	394,210
Commercial real estate
Loans evaluated for impairment:
Total loans held for investment						1,109,237	1,143,751
Construction, land & land development
Loans evaluated for impairment:
Total loans held for investment						201,992	249,704
Residential mortgage
Loans evaluated for impairment:
Total loans held for investment						239,834	245,191
Consumer and other
Loans evaluated for impairment:
Total loans held for investment						20,643	11,439
Originated
Allowance for loan losses:
Beginning balance	29,111	38,083	23,855	32,722	32,722
Provision	1,816	9,026	7,507	23,691	55,981
Charge-offs	(434)	(3,029)	(1,577)	(12,914)	(65,820)
Recoveries	36	121	744	702	972
Ending balance	30,529	44,201	30,529	44,201	23,855
Loans evaluated for impairment:
Collectively evaluated for impairment						2,430,570	2,256,897	2,150,069
Individually evaluated for impairment						46,184	45,031	64,995
Total loans held for investment						2,476,754	2,301,928	2,215,064
Allowance for loans losses evaluated:
Collectively evaluated for impairment						23,450	23,342	25,063
Individually evaluated for impairment						7,079	513	19,138
Total allowance for loan losses	29,111	38,083	23,855	32,722	32,722	30,529	23,855	44,201
Originated | Commercial & Industrial
Allowance for loan losses:
Beginning balance	15,155	24,352	9,491	23,084	23,084
Provision	1,736	9,421	7,970	19,978	51,189
Charge-offs	(308)	(3,006)	(1,443)	(12,871)	(65,684)
Recoveries	23	113	588	689	902
Ending balance	16,606	30,880	16,606	30,880	9,491
Loans evaluated for impairment:
Collectively evaluated for impairment						1,010,269	867,924	847,384
Individually evaluated for impairment						42,085	36,407	58,299
Total loans held for investment						1,052,354	904,331	905,683
Allowance for loans losses evaluated:
Collectively evaluated for impairment						9,556	9,097	11,756
Individually evaluated for impairment						7,050	394	19,124
Total allowance for loan losses	15,155	24,352	9,491	23,084	23,084	16,606	9,491	30,880
Originated | Owner occupied commercial real estate
Allowance for loan losses:
Beginning balance	2,763	2,083	2,609	1,675	1,675
Provision	62	41	216	449	934
Ending balance	2,825	2,124	2,825	2,124	2,609
Loans evaluated for impairment:
Collectively evaluated for impairment						306,514	264,876	221,984
Individually evaluated for impairment								778
Total loans held for investment						306,514	264,876	222,762
Allowance for loans losses evaluated:
Collectively evaluated for impairment						2,825	2,609	2,124
Total allowance for loan losses	2,763	2,083	2,609	1,675	1,675	2,825	2,609	2,124
Originated | Commercial real estate
Allowance for loan losses:
Beginning balance	8,347	7,200	8,576	4,525	4,525
Provision	(162)	340	(391)	3,015	4,077
Charge-offs					(26)
Ending balance	8,185	7,540	8,185	7,540	8,576
Loans evaluated for impairment:
Collectively evaluated for impairment						805,362	808,874	705,201
Individually evaluated for impairment						1,979	7,155	5,230
Total loans held for investment						807,341	816,029	710,431
Allowance for loans losses evaluated:
Collectively evaluated for impairment						8,185	8,576	7,540
Total allowance for loan losses	8,347	7,200	8,576	4,525	4,525	8,185	8,576	7,540
Originated | Construction, land & land development
Allowance for loan losses:
Beginning balance	1,536	2,837	1,852	2,337	2,337
Provision	40	(410)	(276)	89	(485)
Recoveries		(1)
Ending balance	1,576	2,426	1,576	2,426	1,852
Loans evaluated for impairment:
Collectively evaluated for impairment						153,522	179,999	240,098
Total loans held for investment						153,522	179,999	240,098
Allowance for loans losses evaluated:
Collectively evaluated for impairment						1,576	1,852	2,426
Total allowance for loan losses	1,536	2,837	1,852	2,337	2,337	1,576	1,852	2,426
Originated | Residential mortgage
Allowance for loan losses:
Beginning balance	1,119	1,244	1,134	815	815
Provision	37	(75)	(3)	354	271
Recoveries	9	3	34	3	48
Ending balance	1,165	1,172	1,165	1,172	1,134
Loans evaluated for impairment:
Collectively evaluated for impairment						135,879	126,190	127,588
Individually evaluated for impairment						2,039	1,255	580
Total loans held for investment						137,918	127,445	128,168
Allowance for loans losses evaluated:
Collectively evaluated for impairment						1,165	1,134	1,158
Individually evaluated for impairment								14
Total allowance for loan losses	1,119	1,244	1,134	815	815	1,165	1,134	1,172
Originated | Consumer and other
Allowance for loan losses:
Beginning balance	191	367	193	286	286
Provision	103	(291)	(9)	(194)	(5)
Charge-offs	(126)	(23)	(134)	(43)	(110)
Recoveries	4	6	122	10	22
Ending balance	172	59	172	59	193
Loans evaluated for impairment:
Collectively evaluated for impairment						19,024	9,034	7,814
Individually evaluated for impairment						81	214	108
Total loans held for investment						19,105	9,248	7,922
Allowance for loans losses evaluated:
Collectively evaluated for impairment						143	74	59
Individually evaluated for impairment						29	119
Total allowance for loan losses	191	367	193	286	286	172	193	59
Acquired
Allowance for loan losses:
Beginning balance	2,825	1,631	2,509	225	225
Provision	(306)	1,974	148	3,309	8,719
Charge-offs	(1,119)	(521)	(1,391)	(542)	(6,765)
Recoveries	62	135	196	227	330
Ending balance	1,462	3,219	1,462	3,219	2,509
Loans evaluated for impairment:
Collectively evaluated for impairment						602,023	722,811	927,091
Individually evaluated for impairment						24,072	48,293	7,955
Purchased credit impaired						20,506	25,188	39,326
Total loans held for investment						646,601	796,292	974,372
Allowance for loans losses evaluated:
Collectively evaluated for impairment						1,056	1,125	803
Individually evaluated for impairment						389	1,262	984
Purchased credit impaired						17	122	1,432
Total allowance for loan losses	2,825	1,631	2,509	225	225	1,462	2,509	3,219
Acquired | Commercial & Industrial
Allowance for loan losses:
Beginning balance	586	379	1,260	46	46
Provision	(321)	299	(838)	641	3,816
Charge-offs	(158)	(330)	(335)	(345)	(2,700)
Recoveries	50	62	70	68	98
Ending balance	157	410	157	410	1,260
Loans evaluated for impairment:
Collectively evaluated for impairment						74,661	110,413	212,246
Individually evaluated for impairment						15,029	34,675	2,332
Purchased credit impaired						2,288	4,506	8,280
Total loans held for investment						91,978	149,594	222,858
Allowance for loans losses evaluated:
Individually evaluated for impairment						157	1,260	201
Purchased credit impaired								209
Total allowance for loan losses	586	379	1,260	46	46	157	1,260	410
Acquired | Owner occupied commercial real estate
Allowance for loan losses:
Beginning balance	1,064	192		4	4
Provision	(103)	565	957	753	1,384
Charge-offs	(961)	(177)	(961)	(177)	(1,405)
Recoveries			4		17
Ending balance		580		580
Loans evaluated for impairment:
Collectively evaluated for impairment						88,714	115,053	135,860
Individually evaluated for impairment						6,958	8,942	1,360
Purchased credit impaired						5,131	5,339	6,605
Total loans held for investment						100,803	129,334	143,825
Allowance for loans losses evaluated:
Individually evaluated for impairment								562
Purchased credit impaired								18
Total allowance for loan losses	1,064	192		4	4			580
Acquired | Commercial real estate
Allowance for loan losses:
Beginning balance	340	24	437	166	166
Provision	144	1	47	(141)	737
Charge-offs					(466)
Recoveries	3		3
Ending balance	487	25	487	25	437
Loans evaluated for impairment:
Collectively evaluated for impairment						291,289	314,913	353,871
Individually evaluated for impairment							2,002	2,060
Purchased credit impaired						10,607	10,807	12,072
Total loans held for investment						301,896	327,722	368,003
Allowance for loans losses evaluated:
Collectively evaluated for impairment						487	429
Purchased credit impaired							8	25
Total allowance for loan losses	340	24	437	166	166	487	437	25
Acquired | Construction, land & land development
Allowance for loan losses:
Beginning balance	9	31	115	8	8
Provision	(6)	746	(91)	744	1,654
Charge-offs			(95)		(1,631)
Recoveries		48	74	73	84
Ending balance	3	825	3	825	115
Loans evaluated for impairment:
Collectively evaluated for impairment						46,984	66,908	86,482
Individually evaluated for impairment						1,468	978
Purchased credit impaired						18	1,819	8,345
Total loans held for investment						48,470	69,705	94,827
Allowance for loans losses evaluated:
Collectively evaluated for impairment						3	14	14
Purchased credit impaired							101	811
Total allowance for loan losses	9	31	115	8	8	3	115	825
Acquired | Residential mortgage
Allowance for loan losses:
Beginning balance	611	994	685	1	1
Provision	(20)	357	(126)	1,299	1,125
Charge-offs				(6)	(548)
Recoveries	7	17	39	74	107
Ending balance	598	1,368	598	1,368	685
Loans evaluated for impairment:
Collectively evaluated for impairment						99,052	113,338	135,944
Individually evaluated for impairment						402	1,691	2,201
Purchased credit impaired						2,462	2,717	4,024
Total loans held for investment						101,916	117,746	142,169
Allowance for loans losses evaluated:
Collectively evaluated for impairment						561	672	780
Individually evaluated for impairment						20		219
Purchased credit impaired						17	13	369
Total allowance for loan losses	611	994	685	1	1	598	685	1,368
Acquired | Consumer and other
Allowance for loan losses:
Beginning balance	215	11	12
Provision		6	199	13	3
Charge-offs		(14)		(14)	(15)
Recoveries	2	8	6	12	24
Ending balance	217	11	217	11	12
Loans evaluated for impairment:
Collectively evaluated for impairment						1,323	2,186	2,688
Individually evaluated for impairment						215	5	2
Total loans held for investment						1,538	2,191	2,690
Allowance for loans losses evaluated:
Collectively evaluated for impairment						5	10	9
Individually evaluated for impairment						212	2	2
Total allowance for loan losses	$ 215	$ 11	$ 12	$ 11	$ 12	$ 217	$ 12	$ 11