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Loans - Loans to Directors and Executive Officers Including Immediate Families (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Receivables Other Related Parties And Retainage [Abstract]
Balance - Beginning of year	$ 9,909,000	$ 8,722,000
New loans and advances	1,153,000	3,057,000
Repayments	(3,004,000)	(2,574,000)
Effect of changes to related parties	417,000	704,000
Balance - End of year	$ 8,475,000	$ 9,909,000

X

- Definition

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Period Type:	instant

X

- Definition

Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-Section 50
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X

- Definition

Amount of increase (decrease) in loans and leases receivable due from related parties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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X

- Definition

Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- References

No definition available.

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