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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash dividends      
Preferred stock stated dividend rate (in hundredths)   5.00%ibcp_PreferredStockStatedDividendRateInHundredths 5.00%ibcp_PreferredStockStatedDividendRateInHundredths
Cash dividends declared (per share) $ 0.18us-gaap_CommonStockDividendsPerShareDeclared $ 0us-gaap_CommonStockDividendsPerShareDeclared $ 0us-gaap_CommonStockDividendsPerShareDeclared
Issuance of shares of common stock (in shares) 30,828us-gaap_StockIssuedDuringPeriodSharesNewIssues 13,604,963us-gaap_StockIssuedDuringPeriodSharesNewIssues 454,842us-gaap_StockIssuedDuringPeriodSharesNewIssues
Share based compensation, common stock (in shares) 107,359us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation 175,789us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation 147,364us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Share based compensation withholding obligation, common stock (in shares)   55,348us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation