Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Other Intangible Assets [Line Items]
Goodwill impairment	$ 0.0	$ 0.0	$ 0.0
Amortization of intangible assets	4.5	3.5	3.4
Impairments to identifiable intangible assets	0.0	0.0	$ 0.0
Mortgage Servicing Rights [Member]
Goodwill And Other Intangible Assets [Line Items]
Aggregate fair value of servicing rights	$ 6.7	$ 9.2
Range of discount rates used for valuation of mortgage servicing rights	10.00%	10.00%

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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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

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Goodwill And Other Intangible Assets [Line Items]

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Material Impairments To Identifiable Intangible Assets

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