The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($)			3 Months Ended			9 Months Ended
	Oct. 27, 2016	Aug. 31, 2014	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization expense			$ 65,000		$ 77,000	$ 196,000	$ 232,000
Impairment of goodwill and other intangible assets				$ 0
CBI Merger
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 11,000,000.0
CBI Merger \| Third-party originators intangible
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 483,000
CBI Merger \| Core deposit intangible
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired		$ 2,200,000