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Loans and Allowance for Loan Losses - Summary of Non Accrual Loan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Total nonaccrual loans	$ 61,767	$ 26,484	$ 34,877
Interest foregone for the year	3,311	2,152	1,153
Amount of foregone interest applied to principal for the year	602	254	535
Interest foregone life-to-date	5,252	2,744	1,952
Amount of foregone interest applied to principal life-to-date	$ 792	$ 471	$ 1,214
Percentage of nonaccrual loans to gross loan portfolio	5.00%	2.00%	3.00%
Percentage of allowance for loan losses to nonaccrual loans	93.00%	174.00%	104.00%

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- Definition

Amount of foregone interest applied to principal.

+ References

No definition available.

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- Definition

Amount of foregone interest applied to principal life to date.

+ References

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- Definition

Interest foregone life to date.

+ References

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X

- Definition

Interest income foregone on non accrual loans.

+ References

No definition available.

+ Details

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- Definition

Loans and leases receivable allowances for loan to nonaccrual loans.

+ References

No definition available.

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

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- Definition

Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.

+ References

No definition available.

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