Securities - Schedule of Gross Realized Gains and Losses on the Sales and Calls of Securities as well as Gains and Losses on Equity Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Securities Gross Realized Gain Loss [Abstract]
Gross realized gains	$ 252	$ 3,816	$ 1,497
Gross realized losses	(57)	(1,083)	(981)
Net gains on debt securities	195	2,733	516
Unrealized gains recognized on securities still held	918	1,541	1,226
Net realized (losses) gains recognized on securities sold		(6)	2,578
Net gains (losses) on equity securities	918	1,535	3,804
Net securities gains (losses)	$ 1,113	$ 4,268	$ 4,320

Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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