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Related Party Transactions (Ending balances of, and contributions to the Isabella Bank Foundation) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
Ending assets	$ 2,030,267	$ 2,032,158
Affiliated Entity [Member] | Isabella Bank Foundation [Member]
Related Party Transaction [Line Items]
Common Stock, Shares Held by Related Party	20,000	20,000
Affiliated Entity [Member] | Isabella Bank Foundation [Member]
Related Party Transaction [Line Items]
Ending assets	$ 1,385	$ 1,511	$ 1,286
Donations	$ 50	$ 50	$ 0

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