Loans and Leases - Accruing and Nonaccrual Troubled Debt Restructured Loans with Payment Defaults (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Accruing and nonaccrual troubled debt restructured loans with payment default
Number of Loans \| loan	0	0
Recorded Investment \| $	$ 0	$ 0
Nonaccrual Troubled Debt Restructured Loans [Member]
Accruing and nonaccrual troubled debt restructured loans with payment default
Number of Loans \| loan	0	1
Recorded Investment \| $	$ 0	$ 34
Nonaccrual Troubled Debt Restructured Loans [Member] \| Real Estate-Residential Secured for Personal Purpose [Member]
Accruing and nonaccrual troubled debt restructured loans with payment default
Number of Loans \| loan	0	1
Recorded Investment \| $	$ 0	$ 34

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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- Definition

Accruing and nonaccrual troubled debt restructured loans for which there was a payment default in the current reporting period and within 12 months following restructuring.

+ References

No definition available.

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