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Derivative Instruments and Hedging Activities - Derivatives Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other comprehensive income (loss)	$ (553)	$ (420)	$ 74
Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount				$ 20,000
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	15,465	16,286
Derivative assets	0	0
Derivative liabilities	533	235
Net loss	(254)	17	71
Gain (loss) recognized in other comprehensive income (loss)	(421)	(185)
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	15,465	16,286
Gain (loss) recognized in other comprehensive income (loss)	(421)	(185)
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net loss	254	(22)	15
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Other Noninterest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net loss	0	0	83
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
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Other Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities	533	235
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Net loss	0	(5)	0
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	$ 0	$ 0	$ 3