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Portfolio Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) - Non-Covered Loans - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 14,968	$ 13,060
Restructured, not on non-accrual	719	2,331
Total Recorded Investment	15,687	15,391
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	11,946	10,046
Restructured, not on non-accrual	719	2,311
Total Recorded Investment	12,665	12,357
CRE - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	422	435
Restructured, not on non-accrual	0	0
Total Recorded Investment	422	435
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	487	231
Restructured, not on non-accrual	0	0
Total Recorded Investment	487	231
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	136	2,286
Restructured, not on non-accrual	0	20
Total Recorded Investment	136	2,306
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	1,602	62
Restructured, not on non-accrual	0	0
Total Recorded Investment	1,602	62
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	375	0
Restructured, not on non-accrual	0	0
Total Recorded Investment	$ 375	$ 0

X

- Definition

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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+ References

No definition available.

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- Definition

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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