Loans - Schedule of Troubled Debt Restructurings Occurred During Period by Portfolio Segment (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	7	12
Pre-Modification Outstanding Recorded Investment	$ 5,120	$ 6,486
Post-Modification Outstanding Recorded Investment	$ 5,107	$ 5,573
Originated Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	7	12
Pre-Modification Outstanding Recorded Investment	$ 5,120	$ 6,486
Post-Modification Outstanding Recorded Investment	$ 5,107	$ 5,573
Commercial Non-Real Estate [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 4,420	$ 29
Post-Modification Outstanding Recorded Investment	$ 4,420	$ 29
Commercial Non-Real Estate [Member] \| Originated Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 4,420	$ 29
Post-Modification Outstanding Recorded Investment	$ 4,420	$ 29
Commercial Real Estate [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	1	3
Pre-Modification Outstanding Recorded Investment	$ 485	$ 4,488
Post-Modification Outstanding Recorded Investment	$ 482	$ 4,446
Commercial Real Estate [Member] \| Originated Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	1	3
Pre-Modification Outstanding Recorded Investment	$ 485	$ 4,488
Post-Modification Outstanding Recorded Investment	$ 482	$ 4,446
Residential Mortgages [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	4	7
Pre-Modification Outstanding Recorded Investment	$ 195	$ 1,961
Post-Modification Outstanding Recorded Investment	$ 185	$ 1,090
Residential Mortgages [Member] \| Originated Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	4	7
Pre-Modification Outstanding Recorded Investment	$ 195	$ 1,961
Post-Modification Outstanding Recorded Investment	$ 185	$ 1,090
Consumer [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 20	$ 8
Post-Modification Outstanding Recorded Investment	$ 20	$ 8
Consumer [Member] \| Originated Loans [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
Number of Contracts \| Contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 20	$ 8
Post-Modification Outstanding Recorded Investment	$ 20	$ 8

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

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=49124121&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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