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Loans - Summary of Recorded Investment by Category for Portfolio Loans Restructured (Details) - Non-Covered Loans $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan	Sep. 30, 2018 USD ($) loan	Sep. 30, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0	1	1
Pre-Modification Outstanding Recorded Balance	$ 187	$ 0	$ 187	$ 676
Post-Modification Outstanding Recorded Balance	$ 187	$ 0	$ 187	$ 676
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0	1
Pre-Modification Outstanding Recorded Balance	$ 187	$ 0
Post-Modification Outstanding Recorded Balance	$ 187	$ 0
Commercial and Industrial Sector [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan				1
Pre-Modification Outstanding Recorded Balance			$ 187	$ 676
Post-Modification Outstanding Recorded Balance			$ 187	$ 676

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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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- Definition

Post-modification amount of investment in financing receivables 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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Pre-modification amount of investment in financing receivables 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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