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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Loans - Ending balance:
Loans and Leases Receivable, Gross	$ 3,891,064	$ 3,158,161
Portfolio loans, net
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	5,187	3,064
Collectively evaluated for impairment	33,961	34,501
Total	39,148	37,565
Loans - Ending balance:
Individually evaluated for impairment	15,660	16,772
Collectively evaluated for impairment	3,787,021	3,101,620
Total	3,803,656	3,119,154
Loans and Leases Receivable, Gross	3,802,681	3,118,392
Portfolio loans, net | Commercial and industrial
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	5,047	2,909
Collectively evaluated for impairment	23,731	24,087
Total	28,778	26,996
Loans - Ending balance:
Individually evaluated for impairment	12,152	12,523
Collectively evaluated for impairment	1,760,953	1,620,191
Total	1,773,105	1,632,714
Portfolio loans, net | Commercial Real Estate Investor Owned
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	3,324	3,420
Total	3,324	3,420
Loans - Ending balance:
Individually evaluated for impairment	281	430
Collectively evaluated for impairment	726,132	544,378
Total	726,413	544,808
Portfolio loans, net | CRE - owner occupied
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,730	2,890
Total	2,730	2,890
Loans - Ending balance:
Individually evaluated for impairment	1,591	1,854
Collectively evaluated for impairment	478,690	348,294
Total	480,281	350,148
Portfolio loans, net | Construction and land development
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	140	155
Collectively evaluated for impairment	1,162	1,149
Total	1,302	1,304
Loans - Ending balance:
Individually evaluated for impairment	1,575	1,903
Collectively evaluated for impairment	286,767	192,639
Total	288,342	194,542
Portfolio loans, net | Residential real estate
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,036	2,023
Total	2,036	2,023
Loans - Ending balance:
Individually evaluated for impairment	61	62
Collectively evaluated for impairment	356,354	240,698
Total	356,415	240,760
Portfolio loans, net | Consumer and other
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	978	932
Total	978	932
Loans - Ending balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	178,125	155,420
Total	179,100	156,182
Loans and Leases Receivable, Gross	$ 178,125	$ 155,420

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Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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-Publisher FASB
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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 45
-Paragraph 2
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Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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