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Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) Derivative	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Derivative	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	$ 315,700,000		$ 315,700,000		$ 229,800,000
Net gain (loss) on change in fair value	(1,087,000)	$ (273,000)	(3,069,000)	$ 480,000
Collateral posted with market value on liability positions with credit risk-related contingent features	$ 31,700,000		$ 31,700,000
Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	54		54		43
Net gain (loss) on change in fair value			$ (1,600,000)	(100,000)
Income (loss) on derivative instrument not designated hedges			$ 2,100,000	$ 1,400,000

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Nominal or face amount used to calculate payment on derivative.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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