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Related Party Transactions (Ending balances of, and contributions to the Isabella Bank Foundation) (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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|---|---|---|---|
| Summary of assets and contribution made to entity | |||
| Ending assets | $ 1,493,137 | $ 1,430,639 | |
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Isabella Bank Foundation [Member]
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| Summary of assets and contribution made to entity | |||
| Ending assets | 1,815 | 1,766 | 1,150 |
| Donations | $ 200 | $ 850 | $ 250 |