Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	$ 1,500	$ 2,899	$ 1,888	$ 3,133
Interest Income Recognized	19	29	40	65
Commercial and Agriculture [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			25	122
Interest Income Recognized				4
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	304	409	529	415
Interest Income Recognized	5	7	11	14
Commercial Real Estate Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	34	369	39	371
Interest Income Recognized		5	1	10
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	563	1,462	690	1,563
Interest Income Recognized	8	11	16	24
Farm Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment	599	659	605	662
Interest Income Recognized	$ 6	$ 6	$ 12	$ 13

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

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