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Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Gross	$ 5,228,014	$ 4,350,001
Non-Covered Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	5,134,737	4,305,626
Loans and Leases Receivable, Gross	5,132,391	4,303,600
Non-Covered Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	2,287,722	2,121,008
Non-Covered Loans | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	1,247,691	843,728
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	660,433	604,498
Non-Covered Loans | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	425,639	330,097
Non-Covered Loans | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	374,162	298,944
Non-Covered Loans | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	139,090	107,351
Loans and Leases Receivable, Gross	136,744	105,325
Pass (1-6) | Non-Covered Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	4,866,633	4,025,173
Pass (1-6) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	2,091,433	1,927,782
Pass (1-6) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	1,226,499	823,128
Pass (1-6) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	625,365	563,003
Pass (1-6) | Non-Covered Loans | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	418,357	318,451
Pass (1-6) | Non-Covered Loans | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	368,241	287,802
Pass (1-6) | Non-Covered Loans | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	136,738	105,007
Watch (7) | Non-Covered Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	177,757	208,768
Watch (7) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	120,930	146,033
Watch (7) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	17,552	15,083
Watch (7) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	28,763	31,834
Watch (7) | Non-Covered Loans | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	7,179	11,580
Watch (7) | Non-Covered Loans | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	3,333	4,232
Watch (7) | Non-Covered Loans | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	0	6
Classified (8 & 9) | Non-Covered Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	88,001	69,659
Classified (8 & 9) | Non-Covered Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	75,359	47,193
Classified (8 & 9) | Non-Covered Loans | CRE - investor owned
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	3,640	5,517
Classified (8 & 9) | Non-Covered Loans | CRE - owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	6,305	9,661
Classified (8 & 9) | Non-Covered Loans | Construction and land development
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	103	66
Classified (8 & 9) | Non-Covered Loans | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	2,588	6,910
Classified (8 & 9) | Non-Covered Loans | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, before unearned loan fees	$ 6	$ 312

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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Amount, before allowance for credit loss, of financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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