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

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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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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss)	$ (263)	$ 154	$ (431)	$ 366
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	18,009		18,009		$ 18,422
Derivative Assets	0		0		189
Derivative Liabilities	274		274		0
Total net gain (loss)	14	(4)	31	(24)
Gain (loss) recognized in other comprehensive income (loss)			(201)		80
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	16,685		16,685		17,076
Gain (loss) recognized in other comprehensive income (loss)			(201)		80
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total net gain (loss)	(14)	6	(30)	26
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Other Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	0		0		185
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Other Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	254		254
Derivative Liabilities	254		254		0
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	1,324		1,324		1,346
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total net gain (loss)	0	0	1	0
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Other Noninterest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total net gain (loss)	0	$ 2	0	$ 2
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Other Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Assets	0		0		4
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Other Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liabilities	$ 20		$ 20		$ 0