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Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Loans - Ending balance:
Loans and Leases Receivable, Gross	$ 3,037,705			$ 2,750,737
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	5,801			2,335
Collectively evaluated for impairment	31,697			31,106
Total	37,498	$ 35,498	$ 34,373	33,441
Loans - Ending balance:
Individually evaluated for impairment	21,862			10,878
Collectively evaluated for impairment	3,015,843			2,739,859
Total	3,038,137			2,750,446
Loans and Leases Receivable, Gross	3,037,705			2,750,737
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	3,785			1,953
Collectively evaluated for impairment	21,623			20,103
Total	25,408	23,808	23,161	22,056
Loans - Ending balance:
Individually evaluated for impairment	13,414			4,514
Collectively evaluated for impairment	1,585,401			1,479,813
Total	1,598,815			1,484,327
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	3,374			3,484
Total	3,374	3,356	3,375	3,484
Loans - Ending balance:
Individually evaluated for impairment	252			921
Collectively evaluated for impairment	514,803			427,143
Total	515,055			428,064
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			6
Collectively evaluated for impairment	2,702			2,963
Total	2,702	2,591	3,117	2,969
Loans - Ending balance:
Individually evaluated for impairment	1,666			1,962
Collectively evaluated for impairment	339,250			340,997
Total	340,916			342,959
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	158			369
Collectively evaluated for impairment	1,244			1,335
Total	1,402	1,219	1,645	1,704
Loans - Ending balance:
Individually evaluated for impairment	1,907			2,800
Collectively evaluated for impairment	186,949			158,261
Total	188,856			161,061
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	3			7
Collectively evaluated for impairment	1,963			1,789
Total	1,966	1,797	1,841	1,796
Loans - Ending balance:
Individually evaluated for impairment	124			681
Collectively evaluated for impairment	233,836			195,817
Total	233,960			196,498
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	1,855			0
Collectively evaluated for impairment	791			1,432
Total	2,646	$ 2,727	$ 1,234	1,432
Loans - Ending balance:
Individually evaluated for impairment	4,499			0
Collectively evaluated for impairment	155,604			137,828
Total	160,535			137,537
Loans and Leases Receivable, Gross	$ 160,103			$ 137,828

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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
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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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