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Securities - Additional Information (Detail)		12 Months Ended
	Apr. 01, 2014 USD ($) Security	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Investments, Debt and Equity Securities [Abstract]
Unrealized loss, other than temporary securities		$ 0
Number of securities | Security	319
Aggregate fair value of securities	$ 167,100,000
Gain/Loss from net unrealized holdings, Net of tax	$ 1,300,000	16,693,000	$ (3,802,000)	$ 1,180,000
Unrealized gain or loss, Held to maturity		0
Tax effect of the proceeds from sale of securities		(16,000)	$ (93,000)	$ 13,000
Pledged of Fair Value of Securities as collateral		106,800,000
Amortization cost of securities as Collateral not Separately Reported		106,400,000
Debt Instrument Repurchase Agreement		90,900,000
Securities Pledged for Federal Home Loan Bank At Fair Value		98,700,000
Securities for Federal Home Loan Bank Not Separately Reported		94,700,000
Securities Pledged For Derivative At Fair Value		33,400,000
Securities Pledged For Derivative At Amortized Cost		33,100,000
Debt Instrument Derivative Swap Agreement		14,800,000
Debt Instrument Federal Home Loan Bank		$ 0

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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