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Benefit Plans (Nonvested Restricted Stock Awards Activity) (Details) - Restricted Stock - Isabella Bank Corporation Restricted Stock Plan - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Number of Shares
Beginning balance (in shares)	20,123	4,658
Granted (in shares)	6,949	15,465
Vested (in shares)	0	0
Forfeited (in shares)	0	0
Ending balance (in shares)	27,072	20,123
Fair Value
Beginning balance	$ 418	$ 82
Granted	174	336
Vested	0	0
Forfeited	0	0
Ending balance	$ 592	$ 418

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
-Name Accounting Standards Codification
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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