Loans - Credit Quality (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	$ 3,125,531	$ 3,084,495
Purchased Credit Impaired	42,652	46,174
Total loans held for investment	3,168,183	3,130,669	$ 1,810,842
Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	6,821	7,742
Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,890	6,348
Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	302,719	303,930
Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,361,882	2,434,857
Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	160,913	118,878
Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	99,774	84,941
Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	138,998	88,794
Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	39,143	31,656
Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	11,391	7,349
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,119,919	1,192,547
Purchased Credit Impaired	10,791	13,905
Total loans held for investment	1,130,710	1,206,452	744,380
Commercial & Industrial [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	5,535	6,464
Commercial & Industrial [Member] | Grade 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	3,890	6,348
Commercial & Industrial [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	195,094	189,370
Commercial & Industrial [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	620,190	798,335
Commercial & Industrial [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	114,031	48,083
Commercial & Industrial [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	39,140	46,068
Commercial & Industrial [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	97,269	63,254
Commercial & Industrial [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	33,379	27,276
Commercial & Industrial [Member] | Grade 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	11,391	7,349
Owner occupied commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	360,526	346,740
Purchased Credit Impaired	6,981	7,149
Total loans held for investment	367,507	353,889	166,604
Owner occupied commercial real estate [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	17,808	17,996
Owner occupied commercial real estate [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	305,946	304,827
Owner occupied commercial real estate [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,518	4,696
Owner occupied commercial real estate [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	16,138	16,114
Owner occupied commercial real estate [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	16,587	2,278
Owner occupied commercial real estate [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,529	829
Commerical real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,008,224	891,827
Purchased Credit Impaired	12,175	12,288
Total loans held for investment	1,020,399	904,115	367,071
Commerical real estate [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	81	84
Commerical real estate [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	23,376	27,851
Commerical real estate [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	899,348	770,241
Commerical real estate [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	25,298	49,275
Commerical real estate [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	35,189	20,246
Commerical real estate [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	23,377	22,540
Commerical real estate [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,555	1,590
Construction, land & land development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	347,574	350,132
Purchased Credit Impaired	8,633	8,681
Total loans held for investment	356,207	358,813	273,125
Construction, land & land development [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,254	4,973
Construction, land & land development [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	319,181	328,296
Construction, land & land development [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	17,356	15,103
Construction, land & land development [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	7,460	1,288
Construction, land & land development [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	865
Construction, land & land development [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	458	472
Residential mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	276,164	289,332
Purchased Credit Impaired	4,072	4,151
Total loans held for investment	280,236	293,483	249,591
Residential mortgage [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	266	268
Residential mortgage [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	62,380	63,118
Residential mortgage [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	207,297	221,463
Residential mortgage [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,412	1,222
Residential mortgage [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,733	1,109
Residential mortgage [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	855	663
Residential mortgage [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	2,221	1,489
Consumer and other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	13,124	13,917
Total loans held for investment	13,124	13,917	$ 10,071
Consumer and other [Member] | Grade 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	939	926
Consumer and other [Member] | Grade 3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	1,807	622
Consumer and other [Member] | Grade 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	9,920	11,695
Consumer and other [Member] | Grade 5 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	298	499
Consumer and other [Member] | Grade 6 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	114	116
Consumer and other [Member] | Grade 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	45	$ 59
Consumer and other [Member] | Grade 8 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, credit risk profile	$ 1