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Note 2 - Business Combination (Tables) | 9 Months Ended
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Sep. 30, 2014
Business Combinations [Abstract] |
Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable [Table Text Block] |
Mercantile common shares issued for Firstbank common shares |  |  | 8,087,272 |
Price per share, based on Mercantile closing price on May 30, 2014 |  | $ | 21.43 |
Value of common stock issued |  |  | 173,310,000 |
Replacement stock options |  |  | 1,664,000 |
Total purchase price |  | $ | 174,974,000 |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] |
Assets |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 91,806,000 |  |  |  |  |
Securities |  |  | 358,599,000 |  |  |  |  |
Total loans |  |  | 943,662,000 |  |  |  |  |
Premises and equipment |  |  | 24,049,000 |  |  |  |  |
Core deposit intangible |  |  | 17,478,000 |  |  |  |  |
Mortgage servicing rights |  |  | 7,389,000 |  |  |  |  |
Other assets |  |  | 8,500,000 |  |  |  |  |
Total Assets |  | $ | 1,451,483,000 |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |
Deposits |  | $ | 1,229,609,000 |  |  |  |  |
Borrowings |  |  | 87,615,000 |  |  |  |  |
Other liabilities |  |  | 10,155,000 |  |  |  |  |
Total Liabilities |  | $ | 1,327,379,000 |  |  |  |  |
Net Identifiable Assets Acquired |  |  |  |  |  | $ | 124,104,000 |
Goodwill |  |  |  |  |  | $ | 50,870,000 |
Business Acquisition, Pro Forma Information [Table Text Block] |
|  | Three months ended Sept 30, |  |  | Nine months ended Sept 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Net interest income |  | $ | 25,989,000 |  |  | $ | 11,994,000 |  |  | $ | 54,924,000 |  |  | $ | 37,080,000 |
Noninterest expense |  |  | 24,572,000 |  |  |  | 14,284,000 |  |  |  | 47,338,000 |  |  |  | 32,944,000 |
Net income |  |  | 3,281,000 |  |  |  | 693,000 |  |  |  | 11,711,000 |  |  |  | 9,617,000 |
Net income per diluted share |  |  | 0.19 |  |  |  | 0.04 |  |  |  | 0.69 |  |  |  | 0.57 |
Business Acquisition, Fair Value of Loans Acquired [Table Text Block] |
|  | Acquired |  |  | Acquired |  |  | Acquired |
|  | Impaired |  |  | Non-Impaired |  |  | Total Loans |
Commercial Loans: |  |  |  |  |  |  |  |  |  |  |  |
Commercial & industrial |  | $ | 878,000 |  |  | $ | 163,316,000 |  |  | $ | 164,194,000 |
Commercial real estate |  |  | 12,973,000 |  |  |  | 378,016,000 |  |  |  | 390,989,000 |
Construction & development |  |  | 1,289,000 |  |  |  | 33,726,000 |  |  |  | 35,015,000 |
Total Commercial Loans |  | $ | 15,140,000 |  |  | $ | 575,058,000 |  |  | $ | 590,198,000 |
Consumer Loans: |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgages |  | $ | 9,694,000 |  |  | $ | 216,653,000 |  |  | $ | 226,347,000 |
Instalment |  |  | 167,000 |  |  |  | 61,657,000 |  |  |  | 61,824,000 |
Home equity lines |  |  | 288,000 |  |  |  | 52,054,000 |  |  |  | 52,342,000 |
Construction |  |  | 76,000 |  |  |  | 12,875,000 |  |  |  | 12,951,000 |
Total Consumer Loans |  | $ | 10,225,000 |  |  | $ | 343,239,000 |  |  | $ | 353,464,000 |
Total Loans |  | $ | 25,365,000 |  |  | $ | 918,297,000 |  |  | $ | 943,662,000 |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block] |
|  | Acquired |
|  | Impaired |
Contractual required payments |  | $ | 44,936,000 |
Nonaccretable difference |  |  | 17,057,000 |
Expected cash flows |  |  | 27,879,000 |
Accretable yield |  |  | 2,514,000 |
Carrying balance |  | $ | 25,365,000 |

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