Loans - Credit Quality (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	$ 20,506	$ 25,188
Total loans held for investment	3,123,355	3,098,220	$ 3,189,436
Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,744,132	2,657,301
Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	121,457	115,258
Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	129,487	150,593
Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	45,154	73,074
Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	62,619	74,995
Grade 9
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		1,811
Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,144,332	1,053,925
Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	407,317	394,210
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,109,237	1,143,751
Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	201,992	249,704
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	239,834	245,191
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	20,643	11,439
Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	2,476,754	2,301,928	2,215,064
Originated | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,243,853	2,081,325
Originated | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	79,771	72,082
Originated | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	80,055	82,438
Originated | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	31,095	26,320
Originated | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	41,980	37,952
Originated | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		1,811
Originated | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,052,354	904,331	905,683
Originated | Commercial & Industrial | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	955,070	818,352
Originated | Commercial & Industrial | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	20,950	11,427
Originated | Commercial & Industrial | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	27,960	24,133
Originated | Commercial & Industrial | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	10,465	14,088
Originated | Commercial & Industrial | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	37,909	34,520
Originated | Commercial & Industrial | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		1,811
Originated | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	306,514	264,876	222,762
Originated | Owner occupied commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	290,525	247,868
Originated | Owner occupied commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,149	13,169
Originated | Owner occupied commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	5,724	513
Originated | Owner occupied commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,116	3,326
Originated | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	807,341	816,029	710,431
Originated | Commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	711,278	716,744
Originated | Commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	45,481	35,812
Originated | Commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	39,360	55,230
Originated | Commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	9,243	6,184
Originated | Commercial real estate | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,979	2,059
Originated | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	153,522	179,999	240,098
Originated | Construction, land & land development | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	146,196	171,287
Originated | Construction, land & land development | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	333	5,590
Originated | Construction, land & land development | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,583	1,931
Originated | Construction, land & land development | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	4,410	1,191
Originated | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	137,918	127,445	128,168
Originated | Residential mortgage | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	121,761	118,042
Originated | Residential mortgage | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	5,856	6,079
Originated | Residential mortgage | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	4,428	573
Originated | Residential mortgage | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,835	1,497
Originated | Residential mortgage | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,038	1,254
Originated | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	19,105	9,248	7,922
Originated | Consumer and other | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	19,023	9,032
Originated | Consumer and other | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2	5
Originated | Consumer and other | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		58
Originated | Consumer and other | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	26	34
Originated | Consumer and other | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	54	119
Acquired
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	20,506	25,188
Total loans held for investment	646,601	796,292	974,372
Acquired | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	500,279	575,976
Acquired | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	41,686	43,176
Acquired | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	49,432	68,155
Acquired | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	14,059	46,754
Acquired | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	20,639	37,043
Acquired | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	2,288	4,506
Total loans held for investment	91,978	149,594	222,858
Acquired | Commercial & Industrial | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	50,407	69,304
Acquired | Commercial & Industrial | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,147	2,982
Acquired | Commercial & Industrial | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	8,945	15,528
Acquired | Commercial & Industrial | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	11,596	33,850
Acquired | Commercial & Industrial | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	11,595	23,424
Acquired | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	5,131	5,339
Total loans held for investment	100,803	129,334	143,825
Acquired | Owner occupied commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	78,583	94,450
Acquired | Owner occupied commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	340	2,533
Acquired | Owner occupied commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	9,791	9,788
Acquired | Owner occupied commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		8,282
Acquired | Owner occupied commercial real estate | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	6,958	8,942
Acquired | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	10,607	10,807
Total loans held for investment	301,896	327,722	368,003
Acquired | Commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	243,221	248,583
Acquired | Commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	20,296	23,854
Acquired | Commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	26,367	39,833
Acquired | Commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,405	2,643
Acquired | Commercial real estate | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		2,002
Acquired | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	18	1,819
Total loans held for investment	48,470	69,705	94,827
Acquired | Construction, land & land development | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	30,459	49,849
Acquired | Construction, land & land development | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	12,490	12,859
Acquired | Construction, land & land development | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,173	2,577
Acquired | Construction, land & land development | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	863	1,623
Acquired | Construction, land & land development | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,467	978
Acquired | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	2,462	2,717
Total loans held for investment	101,916	117,746	142,169
Acquired | Residential mortgage | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	96,287	111,818
Acquired | Residential mortgage | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,413	948
Acquired | Residential mortgage | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,156	215
Acquired | Residential mortgage | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	195	356
Acquired | Residential mortgage | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	403	1,692
Acquired | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,538	2,191	$ 2,690
Acquired | Consumer and other | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,322	1,972
Acquired | Consumer and other | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		214
Acquired | Consumer and other | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	$ 216	$ 5