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Loans - Schedule of Loan Modifications (Detail)	9 Months Ended
	Sep. 30, 2020 USD ($) Loan Contract	Sep. 30, 2019 USD ($)
Financing Receivable Modifications [Line Items]
Number of Loans | Contract	1
Balance	$ 0	$ 0
CARES Act [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	813
Balance	$ 431,283,000
Second Modifications [Member] | CARES Act [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	47
Balance	$ 52,186,000
Weighted Average Interest Rate	4.63%
Commercial and Agriculture [Member] | Second Modifications [Member] | CARES Act [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	12
Balance	$ 1,370,000
Weighted Average Interest Rate	4.61%
Commercial Real Estate Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	19
Balance	$ 16,076,000
Weighted Average Interest Rate	4.51%
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Contract	1
Commercial Real Estate Non Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	14
Balance	$ 27,720,000
Weighted Average Interest Rate	4.96%
Real Estate Construction [Member] | Second Modifications [Member] | CARES Act [Member]
Financing Receivable Modifications [Line Items]
Number of Loans | Loan	2
Balance	$ 7,020,000
Weighted Average Interest Rate	3.59%

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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