Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Derivative Instruments and Hedging Activities - Derivatives Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net unrealized holding gains (losses) arising during the period	$ 154	$ (92)	$ 366	$ (85)
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	18,827		18,827		$ 19,224
Derivative Assets	422		422		13
Derivative Liabilities	0		0		12
Net loss	(4)	(34)	(24)	(102)
Net unrealized holding gains (losses) arising during the period			321		9
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	17,460		17,460		17,836
Net unrealized holding gains (losses) arising during the period			321		9
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net loss	6	36	26	107
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Other Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	407		407		13
Derivative Liabilities	407		407
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Other Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities	0		0		0
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	1,367		1,367		1,388
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Other Noninterest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net loss	2	$ 2	2	$ 5
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Other Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	15		15		0
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Other Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities	$ 0		$ 0		$ 12