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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) Contract	Jun. 30, 2019 USD ($) Loan Contract	Dec. 31, 2018 Loan
Financing Receivable Modifications [Line Items]
Number of Contracts Modified in the Last three Months | Loan		4	0
Commercial and Industrial [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts Modified in the Last three Months | Contract	4	4
Pre-Modification Outstanding Recorded Investment	$ 812	$ 812
Post-Modification Outstanding Recorded Investment	$ 812	$ 812

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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