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Portfolio Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans, including unearned loan fees	$ 4,350,001	$ 4,097,050
Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Total	4,305,626	4,024,221
Loans, including unearned loan fees	4,303,600	4,022,896
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total	2,121,008	1,918,720
Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Total	843,728	769,275
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total	604,498	554,589
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total	330,097	303,091
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total	298,944	341,312
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Total	107,351	137,234
Loans, including unearned loan fees	105,325	135,909
Pass (1-6) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, including unearned loan fees	4,025,173	3,794,940
Pass (1-6) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total	1,927,782	1,769,102
Pass (1-6) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Total	823,128	754,010
Pass (1-6) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total	563,003	514,616
Pass (1-6) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total	318,451	292,766
Pass (1-6) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total	287,802	329,742
Pass (1-6) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, including unearned loan fees	105,007	134,704
Watch (7) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, including unearned loan fees	208,768	152,923
Watch (7) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total	146,033	94,002
Watch (7) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Total	15,083	10,840
Watch (7) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total	31,834	34,440
Watch (7) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total	11,580	9,983
Watch (7) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total	4,232	3,648
Watch (7) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, including unearned loan fees	6	10
Classified (8 & 9) | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Loans, including unearned loan fees	69,659	75,033
Classified (8 & 9) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total	47,193	55,616
Classified (8 & 9) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment [Line Items]
Total	5,517	4,425
Classified (8 & 9) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Total	9,661	5,533
Classified (8 & 9) | Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total	66	342
Classified (8 & 9) | Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Total	6,910	7,922
Classified (8 & 9) | Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment [Line Items]
Loans, including unearned loan fees	$ 312	$ 1,195

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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