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Subordinated Debentures (Details) (USD $) | 1 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2004 | Sep. 16, 2004 Series A Notes [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] | Dec. 10, 2004 Series B Preferred Stock [Member] | Sep. 30, 2004 Common Class A [Member] Mercantile Bank Capital Trust [Member] | Dec. 31, 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 |  |  |  |
Subordinated Debentures (Textual) [Abstract] |  |  |  |  |  |  |
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 outflow to reacquire preferred stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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