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Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) loan	Sep. 30, 2016 loan	Dec. 31, 2016 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Restructured, not on non-accrual	$ 9,500
Impaired Financing Receivable, Related Allowance	1,200
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 8,985		$ 15,391
Financing Receivable, Modifications, Number of Contracts | loan	1	4
Non-accrual	$ 8,264		13,060
Restructured, not on non-accrual	721		2,331
Impaired Financing Receivable, Related Allowance	2,374		3,064
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2,417		3,064
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 7,451		12,357
Financing Receivable, Modifications, Number of Contracts | loan	1	2
Non-accrual	$ 6,730		10,046
Restructured, not on non-accrual	721		2,311
Impaired Financing Receivable, Related Allowance	2,020		2,909
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	2,063		2,909
Non-Covered Loans | Commercial - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 544		435
Financing Receivable, Modifications, Number of Contracts | loan	0	1
Non-accrual	$ 544		435
Restructured, not on non-accrual	0		0
Impaired Financing Receivable, Related Allowance	120		0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	120		0
Non-Covered Loans | Commercial - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 0		231
Financing Receivable, Modifications, Number of Contracts | loan	0	0
Non-accrual	$ 0		231
Restructured, not on non-accrual	0		0
Impaired Financing Receivable, Related Allowance	0		0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 322		2,306
Financing Receivable, Modifications, Number of Contracts | loan	0	1
Non-accrual	$ 322		2,286
Restructured, not on non-accrual	0		20
Impaired Financing Receivable, Related Allowance	186		155
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	186		155
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	668		62
Non-accrual	668		62
Restructured, not on non-accrual	0		0
Impaired Financing Receivable, Related Allowance	48		0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	48		0
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 0		0
Financing Receivable, Modifications, Number of Contracts | loan	0	0
Non-accrual	$ 0		0
Restructured, not on non-accrual	0		0
Impaired Financing Receivable, Related Allowance	0		0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 0		$ 0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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