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Securities - Additional Information (Detail)		12 Months Ended
	Apr. 01, 2014 USD ($) Security	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
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	(3,802,000)	$ 1,180,000	$ (4,927,000)
Unrealized gain or loss, Held to maturity		0
Tax effect of the proceeds from sale of securities		(93,000)	$ 13,000	$ 643,000
Pledged of Fair Value of Securities as collateral		58,800,000
Amortization cost of securities as Collateral not Separately Reported		60,700,000
Debt Instrument Repurchase Agreement		52,100,000
Securities Pledged for Federal Home Loan Bank At Fair Value		96,200,000
Securities for Federal Home Loan Bank Not Separately Reported		95,900,000
Securities Pledged For Derivative At Fair Value		11,100,000
Securities Pledged For Derivative At Amortized Cost		11,200,000
Debt Instrument Derivative Swap Agreement		1,800,000
Debt Instrument Federal Home Loan Bank		$ 0

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Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

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Amount of unrealized gain (loss) from transfer of investment in debt security measured at amortized cost (held-to-maturity), to investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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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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