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Subordinated Debentures - Additional Information (Detail) (USD $) | 1 Months Ended |  |  | 0 Months Ended
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Sep. 30, 2004 | Sep. 16, 2004 Series A Note [Member] Mercantile Bank Capital Trust [Member] | Dec. 10, 2004 Series B Notes [Member] Mercantile Bank Capital Trust [Member] | Sep. 16, 2004 Series A Preferred Stock [Member] | Sep. 16, 2004 Common Class A [Member] Mercantile Bank Capital Trust [Member] | Dec. 10, 2004 Series B Preferred Stock [Member] | Dec. 10, 2004 Common Class B [Member] Mercantile Bank Capital Trust [Member]
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Series A and B Preferred Securities sold in a private sale |  |  |  | $ 16,000,000 |  | $ 16,000,000 |
Series A and B Common Securities sold by trust to Mercantile |  |  |  |  | 495,000 |  | 495,000
Proceeds of series A preferred securities and series A common securities used to purchase of series A floating rate notes |  | 16,495,000 | 16,495,000 |  |  |  |
Preferred Securities percentage | 9.60% |  |  |  |  |  |
Proceeds of Series A floating rate notes to finance redemption | $ 16,000,000 |  |  |  |  |  |

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- Definition The cash inflow from issuance of preferred stocks by a business trust or other special purpose entity, mainly established by a bank holding entity, to third party investors. The trust's assets are deeply subordinated debentures of the bank holding entity. Most trust preferred securities are subject to a mandatory redemption upon the repayment of the debentures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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