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Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Loans - Ending balance:
Loans and Leases Receivable, Gross	$ 4,275,761		$ 4,097,050
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	3,886		2,579
Collectively evaluated for impairment	38,121		35,587
Total	42,007	$ 40,263	38,166
Loans - Ending balance:
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums	(1,085)		(1,325)
Individually evaluated for impairment	16,208		17,175
Collectively evaluated for impairment	4,198,788		4,005,721
Total	4,216,081		4,024,221
Loans and Leases Receivable, Gross	4,214,996		4,022,896
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	3,667		2,508
Collectively evaluated for impairment	25,757		23,898
Total	29,424	27,410	26,406
Loans - Ending balance:
Individually evaluated for impairment	11,226		12,665
Collectively evaluated for impairment	2,026,814		1,906,055
Total	2,038,040		1,918,720
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	0		0
Collectively evaluated for impairment	4,561		3,890
Total	4,561	4,546	3,890
Loans - Ending balance:
Individually evaluated for impairment	410		422
Collectively evaluated for impairment	819,017		768,853
Total	819,427		769,275
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	219		71
Collectively evaluated for impairment	3,626		3,237
Total	3,845	3,502	3,308
Loans - Ending balance:
Individually evaluated for impairment	2,150		1,975
Collectively evaluated for impairment	590,988		552,614
Total	593,138		554,589
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	1,690		1,487
Total	1,690	1,728	1,487
Loans - Ending balance:
Individually evaluated for impairment	435		136
Collectively evaluated for impairment	299,682		302,955
Total	300,117		303,091
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	1,763		2,237
Total	1,763	2,315	2,237
Loans - Ending balance:
Individually evaluated for impairment	1,669		1,602
Collectively evaluated for impairment	316,386		339,710
Total	318,055		341,312
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	724		838
Total	724	$ 762	838
Loans - Ending balance:
Individually evaluated for impairment	318		375
Collectively evaluated for impairment	145,901		135,534
Total	147,304		137,234
Loans and Leases Receivable, Gross	$ 146,219		$ 135,909

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- Definition

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
-SubTopic 10
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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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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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