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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, 2019	Dec. 31, 2018
Summary of Recorded Investment in Non-covered Loans by Portfolio Class and Category Based on Impairment Method [Line Items]
Total	$ 43,095	$ 43,476
Loans - Ending balance:
Loans and Leases Receivable, Gross	5,017,077	4,350,001
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	2,914	4,453
Collectively evaluated for impairment	39,031	37,842
Total	41,945	42,295
Loans - Ending balance:
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(1,912)	(2,026)
Individually evaluated for impairment	11,436	18,071
Collectively evaluated for impairment	4,883,138	4,285,529
Total	4,896,486	4,305,626
Loans and Leases Receivable, Gross	4,894,574	4,303,600
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	2,199	4,266
Collectively evaluated for impairment	26,461	24,773
Total	28,660	29,039
Loans - Ending balance:
Individually evaluated for impairment	7,205	12,950
Collectively evaluated for impairment	2,202,232	2,108,058
Total	2,209,437	2,121,008
Portfolio loans, net | CRE - 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	596	0
Collectively evaluated for impairment	4,743	4,683
Total	5,339	4,683
Loans - Ending balance:
Individually evaluated for impairment	1,527	398
Collectively evaluated for impairment	1,143,341	843,330
Total	1,144,868	843,728
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	119	109
Collectively evaluated for impairment	3,655	4,130
Total	3,774	4,239
Loans - Ending balance:
Individually evaluated for impairment	2,296	2,135
Collectively evaluated for impairment	644,902	602,363
Total	647,198	604,498
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	0	0
Collectively evaluated for impairment	1,699	1,987
Total	1,699	1,987
Loans - Ending balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	358,884	330,097
Total	358,884	330,097
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	52
Collectively evaluated for impairment	1,625	1,564
Total	1,625	1,616
Loans - Ending balance:
Individually evaluated for impairment	408	2,277
Collectively evaluated for impairment	416,323	296,667
Total	416,731	298,944
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	26
Collectively evaluated for impairment	848	705
Total	848	731
Loans - Ending balance:
Individually evaluated for impairment	0	311
Collectively evaluated for impairment	117,456	105,014
Total	119,368	107,351
Loans and Leases Receivable, Gross	$ 117,456	$ 105,325

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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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-Publisher FASB
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-Topic 310
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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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The balance of financing receivables that were collectively evaluated for impairment.

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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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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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Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

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