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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 76,851,000	$ 76,851,000
Amortization of core deposit intangible assets	913,000	945,000	$ 366,000
Aggregate mortgage servicing rights (MSRs) amortization	524,000	247,000	$ 126,000
Fair value of servicing rights	$ 2,245,000	$ 1,562,000
Fair value of servicing rights, discount rate	12.00%	12.00%
Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of servicing rights prepayment speed	12.00%	11.40%
Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of servicing rights prepayment speed	50.00%	50.00%
Weighted Average [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of servicing rights, discount rate	0.93%	0.85%

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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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The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. 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 after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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