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Related Party Transactions (Ending balances of, and contributions to the Isabella Bank Foundation) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Ending assets	$ 2,058,968	$ 2,030,267
Affiliated Entity [Member] | Isabella Bank Foundation [Member]
Related Party Transaction [Line Items]
Ending assets	1,221	1,385	$ 1,511
Donations	$ 0	$ 50	$ 50

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