Derivative Instruments and Hedging Activities - Gains (Losses) on Interest Rate Derivatives Designated as Fair Value Hedges (Detail) - Fair value hedge - Interest income - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Interest rate swaps
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Gain (loss) related to derivative interest rate swaps	$ 131	$ 97
Loans and borrowings \| Derivatives designated as hedging instruments:
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Gain (loss) related to hedged loans	$ (131)	$ (97)

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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