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Short-Term and Other Borrowings - Summary of Federal Funds Purchased and Other Short-term Borrowings are Included in Short-term Federal Home Loan Bank Advances on Consolidated Balance Sheets (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Maximum indebtedness	$ 35,000,000		$ 50,000,000
Average balance	$ 543,000		$ 385,000
Average rate paid	(1.47%)		0.35%
Short Term Borrowings, FHLB advances [Member]
Short-term Debt [Line Items]
Outstanding balance		$ 101,500,000		$ 101,500,000
Interest rate on balance		1.63%		1.63%
Maximum indebtedness		$ 167,500,000	$ 102,700,000	$ 192,700,000
Average balance		$ 146,977,000	$ 10,888,000	$ 117,229,000
Average rate paid		2.34%	1.64%	2.44%

X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Definition

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.

+ References

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- Definition

The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

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- Definition

Weighted average interest rate of short-term debt outstanding calculated over time.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

No definition available.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

+ References

No definition available.

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