Loans - Schedule of Major Portfolio Segment and Non-Classified and Classified Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loan portfolio segments
Loans held for investment	$ 2,934,898	$ 2,699,509
Unearned net loan fees	(793)	(304)
Total loans	2,934,105	2,699,205
Non-classified
Loan portfolio segments
Loans held for investment	2,876,993	2,648,431
Classified
Loan portfolio segments
Loans held for investment	57,905	51,078
Commercial
Loan portfolio segments
Loans held for investment	1,217,001	1,174,570
Commercial | Non-classified
Loan portfolio segments
Loans held for investment	1,172,779	1,132,845
Commercial | Classified
Loan portfolio segments
Loans held for investment	44,222	41,725
Commercial | Manufacturing
Loan portfolio segments
Loans held for investment	96,618	135,050
Commercial | Manufacturing | Non-classified
Loan portfolio segments
Loans held for investment	96,465	132,083
Commercial | Manufacturing | Classified
Loan portfolio segments
Loans held for investment	153	2,967
Commercial | Finance and insurance
Loan portfolio segments
Loans held for investment	50,351	64,279
Commercial | Finance and insurance | Non-classified
Loan portfolio segments
Loans held for investment	49,764	64,243
Commercial | Finance and insurance | Classified
Loan portfolio segments
Loans held for investment	587	36
Commercial | Health care
Loan portfolio segments
Loans held for investment	154,023	126,511
Commercial | Health care | Non-classified
Loan portfolio segments
Loans held for investment	153,468	126,049
Commercial | Health care | Classified
Loan portfolio segments
Loans held for investment	555	462
Commercial | Real estate services
Loan portfolio segments
Loans held for investment	126,044	118,863
Commercial | Real estate services | Non-classified
Loan portfolio segments
Loans held for investment	125,531	117,283
Commercial | Real estate services | Classified
Loan portfolio segments
Loans held for investment	513	1,580
Commercial | Construction
Loan portfolio segments
Loans held for investment	58,718	57,906
Commercial | Construction | Non-classified
Loan portfolio segments
Loans held for investment	55,471	56,581
Commercial | Construction | Classified
Loan portfolio segments
Loans held for investment	3,247	1,325
Commercial | Wholesale and retail trade
Loan portfolio segments
Loans held for investment		221,112
Commercial | Public administration
Loan portfolio segments
Loans held for investment	255,997	221,112
Commercial | Public administration | Non-classified
Loan portfolio segments
Loans held for investment	254,861	211,373
Commercial | Public administration | Classified
Loan portfolio segments
Loans held for investment	1,136	9,739
Commercial | Commercial - Other
Loan portfolio segments
Loans held for investment	475,250	450,849
Commercial | Commercial - Other | Non-classified
Loan portfolio segments
Loans held for investment	437,219	425,233
Commercial | Commercial - Other | Classified
Loan portfolio segments
Loans held for investment	38,031	25,616
Real estate - mortgage
Loan portfolio segments
Loans held for investment	1,171,596	1,017,072
Real estate - mortgage | Residential and commercial owner-occupied
Loan portfolio segments
Loans held for investment	475,523	436,855
Real estate - mortgage | Residential and commercial investor
Loan portfolio segments
Loans held for investment	696,073	578,892
Real estate - mortgage | Real estate - mortgage - Other
Loan portfolio segments
Loans held for investment		1,325
Real estate - mortgage | Non-classified
Loan portfolio segments
Loans held for investment	1,164,197	1,010,965
Real estate - mortgage | Non-classified | Residential and commercial owner-occupied
Loan portfolio segments
Loans held for investment	469,027	431,805
Real estate - mortgage | Non-classified | Residential and commercial investor
Loan portfolio segments
Loans held for investment	695,170	577,835
Real estate - mortgage | Non-classified | Real estate - mortgage - Other
Loan portfolio segments
Loans held for investment		1,325
Real estate - mortgage | Classified
Loan portfolio segments
Loans held for investment	7,399	6,107
Real estate - mortgage | Classified | Residential and commercial owner-occupied
Loan portfolio segments
Loans held for investment	6,496	5,050
Real estate - mortgage | Classified | Residential and commercial investor
Loan portfolio segments
Loans held for investment	903	1,057
Construction and land
Loan portfolio segments
Loans held for investment	175,738	202,011
Construction and land | Non-classified
Loan portfolio segments
Loans held for investment	172,816	201,984
Construction and land | Classified
Loan portfolio segments
Loans held for investment	2,922	27
Consumer
Loan portfolio segments
Loans held for investment	266,947	253,240
Consumer | Non-classified
Loan portfolio segments
Loans held for investment	265,307	252,869
Consumer | Classified
Loan portfolio segments
Loans held for investment	1,640	371
Other
Loan portfolio segments
Loans held for investment	103,616	52,616
Other | Non-classified
Loan portfolio segments
Loans held for investment	101,894	49,768
Other | Classified
Loan portfolio segments
Loans held for investment	$ 1,722	$ 2,848