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Note 20 - Subordinated Debentures | 12 Months Ended
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Dec. 31, 2015
Subordinated Borrowings [Abstract] |
Subordinated Borrowings Disclosure [Text Block] | NOTE 20 – SUBORDINATED DEBENTURES We have five business trusts that are wholly-owned subsidiaries of Mercantile, four of which were assumed by Mercantile in conjunction with the Firstbank merger. A fair value discount of $15.0 million was recorded at the time of the merger, which is being amortized at $0.7 million annually over the next 21.5 years. Each of the trusts was formed to issue Preferred Securities that were sold in private sales, as well as selling Common Securities to Mercantile. The proceeds from the Preferred and Common Securities sales were used by the trusts to purchase Floating Rate Notes issued by Mercantile. The rates of interest, interest payment dates, call features and maturity dates of each Floating Rate Note are identical to its respective Preferred Securities. The net proceeds from the issuance of the Floating Rate Notes were used for a variety of purposes, including contributions to the Bank as capital to provide support for asset growth and the funding of stock repurchase programs and certain acquisitions. The only significant assets of our trusts are the Floating Rate Notes, and the only significant liabilities of our trusts are the Preferred Securities. The Floating Rate Notes are categorized on our Consolidated Balance Sheets as subordinated debentures and the interest expense is recorded on our Consolidated Statements of Income under interest expense on other borrowings. The following table depicts our five business trusts as of December 31, 2015:
|  | Preferred Securities |  |  |  |  |
Trust Name |  | Outstanding |  | Interest Rate |  | Maturity Date |
Mercantile Bank Capital Trust I |  | $32,000,000 |  | 3 Month Libor + 218 bps |  | September 16, 2034 |
Firstbank Capital Trust I |  | $10,000,000 |  | 3 Month Libor + 199 bps |  | October 18, 2034 |
Firstbank Capital Trust II |  | $10,000,000 |  | 3 Month Libor + 127 bps |  | April 7, 2036 |
Firstbank Capital Trust III |  | $7,500,000 |  | 3 Month Libor + 135 bps |  | July 30, 2037 |
Firstbank Capital Trust IV |  | $7,500,000 |  | 3 Month Libor + 135 bps |  | July 30, 2037 |
On January 26, 2016, we closed on a repurchase of trust preferred securities that were auctioned as part of a pooled collateralized debt obligation (“Fund”). The Fund owned $11.0 million of the $32.0 million in trust preferred securities that had been issued by Mercantile Bank Capital Trust I. The $11.0 million in trust preferred securities was retired upon the repurchase, resulting in a commensurate reduction in the related Floating Rate Junior Subordinate Note, leaving $21.0 million outstanding.

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- Definition The entire disclosure for borrowings under subordinated debt agreements that qualify as available in computing net capital under SEC's uniform net capital rule, including restrictive covenants, collateral, interest rates and due dates, amounts due by date and amount owed in total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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