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OREO (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Foreclosed Real Estate
Other real estate owned (OREO)	$ 3,057	$ 3,057	$ 376	$ 4,571	$ 3,057
Other repossessed assets				1	1
Total OREO				4,571	3,057
OREO
Other Real Estate, Beginning Balance	3,057	376
Additions, transfers from loans	2,867	4,872	4,025
Additions, fair value from acquisition		149
Sales of OREO	(1,282)	(2,277)
Capitalized improvements		2
Cash payments collected	(3)	(3)
Valuation allowance for OREO	(68)	(62)
Other Real Estate, Ending Balance	4,571	3,057	$ 376
Commercial Real Estate Loans
Foreclosed Real Estate
Other real estate owned (OREO)	2,657	2,657		4,206	2,657
OREO
Other Real Estate, Beginning Balance	2,657
Other Real Estate, Ending Balance	4,206	2,657
Residential real estate
Foreclosed Real Estate
Other real estate owned (OREO)	399	399		364	$ 399
Residential real estate in the process of foreclosure				$ 1,000
OREO
Other Real Estate, Beginning Balance	399
Other Real Estate, Ending Balance	$ 364	$ 399

X

- Definition

Value transferred from commercial and mortgage loans to real estate owned (REO) in noncash transactions.

+ References

No definition available.

+ Details

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X

- Definition

Represents capitalized improvements.

+ References

No definition available.

+ Details

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X

- Definition

Additions of other real estate, at fair value, resulting from an acquisition. This includes prior real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

No definition available.

+ Details

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X

- Definition

Amount of cash payments collected from other real estate.

+ References

No definition available.

+ Details

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X

- Definition

Represents the value of real estate loans in the process of foreclosure at period end.

+ References

No definition available.

+ Details

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Namespace Prefix:	buse_
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X

- Definition

Represents sales of OREO.

+ References

No definition available.

+ Details

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X

- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5162-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4437-111522

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X

- Definition

Carrying amount as of the balance sheet date of assets other than real property that were received in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5162-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
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-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4437-111522

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5162-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4437-111522

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X

- Definition

Total Increase or Decrease in the real estate owned valuation allowance for period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-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

No definition available.

+ Details

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- Details

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