Loans - Credit Quality (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	$ 22,476	$ 25,188
Total loans held for investment	3,012,275	3,098,220	$ 3,168,183
Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,559,833	2,657,301
Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	134,110	115,258
Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	135,743	150,593
Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	90,499	73,074
Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	67,645	74,995
Grade 9
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,969	1,811
Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,012,982	1,053,925
Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	415,595	394,210
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,129,031	1,143,751
Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	201,946	249,704
Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	241,839	245,191
Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	10,882	11,439
Originated
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	2,282,211	2,301,928	2,075,548
Originated | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,028,679	2,081,325
Originated | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	90,895	72,082
Originated | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	79,998	82,438
Originated | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	37,622	26,320
Originated | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	43,048	37,952
Originated | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,969	1,811
Originated | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	889,848	904,331	847,538
Originated | Commercial & Industrial | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	772,640	818,352
Originated | Commercial & Industrial | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	28,259	11,427
Originated | Commercial & Industrial | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	26,645	24,133
Originated | Commercial & Industrial | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	22,041	14,088
Originated | Commercial & Industrial | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	38,294	34,520
Originated | Commercial & Industrial | Grade 9
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,969	1,811
Originated | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	292,413	264,876	205,050
Originated | Owner occupied commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	273,067	247,868
Originated | Owner occupied commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	4,975	13,169
Originated | Owner occupied commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	10,656	513
Originated | Owner occupied commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,715	3,326
Originated | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	809,026	816,029	636,539
Originated | Commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	712,740	716,744
Originated | Commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	45,483	35,812
Originated | Commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	40,944	55,230
Originated | Commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,838	6,184
Originated | Commercial real estate | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,021	2,059
Originated | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	151,114	179,999	252,642
Originated | Construction, land & land development | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	141,491	171,287
Originated | Construction, land & land development | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	4,548	5,590
Originated | Construction, land & land development | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,697	1,931
Originated | Construction, land & land development | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,378	1,191
Originated | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	130,799	127,445	123,941
Originated | Residential mortgage | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	119,939	118,042
Originated | Residential mortgage | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,626	6,079
Originated | Residential mortgage | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile		573
Originated | Residential mortgage | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	620	1,497
Originated | Residential mortgage | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,614	1,254
Originated | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	9,011	9,248	9,838
Originated | Consumer and other | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	8,802	9,032
Originated | Consumer and other | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	4	5
Originated | Consumer and other | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	56	58
Originated | Consumer and other | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	30	34
Originated | Consumer and other | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	119	119
Acquired
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	22,476	25,188
Total loans held for investment	730,064	796,292	1,092,635
Acquired | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	531,154	575,976
Acquired | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	43,215	43,176
Acquired | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	55,745	68,155
Acquired | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	52,877	46,754
Acquired | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	24,597	37,043
Acquired | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	3,805	4,506
Total loans held for investment	123,134	149,594	283,172
Acquired | Commercial & Industrial | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	58,662	69,304
Acquired | Commercial & Industrial | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	4,399	2,982
Acquired | Commercial & Industrial | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,618	15,528
Acquired | Commercial & Industrial | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	37,556	33,850
Acquired | Commercial & Industrial | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	11,094	23,424
Acquired | Owner occupied commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	5,246	5,339
Total loans held for investment	123,182	129,334	162,457
Acquired | Owner occupied commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	89,004	94,450
Acquired | Owner occupied commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,322	2,533
Acquired | Owner occupied commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	9,706	9,788
Acquired | Owner occupied commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	8,161	8,282
Acquired | Owner occupied commercial real estate | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	8,743	8,942
Acquired | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	10,699	10,807
Total loans held for investment	320,005	327,722	383,860
Acquired | Commercial real estate | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	246,254	248,583
Acquired | Commercial real estate | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	22,183	23,854
Acquired | Commercial real estate | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	34,288	39,833
Acquired | Commercial real estate | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	4,669	2,643
Acquired | Commercial real estate | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,912	2,002
Acquired | Construction, land & land development
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	18	1,819
Total loans held for investment	50,832	69,705	103,565
Acquired | Construction, land & land development | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	31,579	49,849
Acquired | Construction, land & land development | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	13,732	12,859
Acquired | Construction, land & land development | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,955	2,577
Acquired | Construction, land & land development | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,212	1,623
Acquired | Construction, land & land development | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,336	978
Acquired | Residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired	2,708	2,717
Total loans held for investment	111,040	117,746	156,295
Acquired | Residential mortgage | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	104,000	111,818
Acquired | Residential mortgage | Grade 5
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	579	948
Acquired | Residential mortgage | Grade 6
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,178	215
Acquired | Residential mortgage | Grade 7
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,279	356
Acquired | Residential mortgage | Grade 8
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,296	1,692
Acquired | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total loans held for investment	1,871	2,191	$ 3,286
Acquired | Consumer and other | Grade 1 To 4
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,655	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