0401 - Disclosure - Summary of Significant Accounting Policies (Policies)
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060302 - Disclosure - Loans and Allowance for Loan Losses (Details 2)
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0522 - Disclosure - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Tables)
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0222 - Disclosure - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements
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06152 - Disclosure - Fair Value Measurements (Details Textual)
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06151 - Disclosure - Fair Value Measurements (Details 1)
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0515 - Disclosure - Fair Value Measurements (Tables)
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0130 - Statement - Consolidated Statements of Comprehensive Income
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06222 - Disclosure - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details 2)
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06221 - Disclosure - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details 1)
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0622 - Disclosure - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements (Details)
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0201 - Disclosure - Summary of Significant Accounting Policies
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0212 - Disclosure - Benefit Plans
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06211 - Disclosure - Quarterly Financial Data Unaudited (Details Textual)
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0621 - Disclosure - Quarterly Financial Data (Unaudited) (Details)
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0521 - Disclosure - Quarterly Financial Data (Unaudited) (Tables)
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06201 - Disclosure - Other Comprehensive Income (loss) (Details Textual)
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0620 - Disclosure - Other Comprehensive Income (loss) (Details)
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0520 - Disclosure - Other Comprehensive Income (loss) (Tables)
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0619 - Disclosure - U.S.Treasury Capital Purchase Program Participation (Details)
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0617 - Disclosure - Subordinated Debentures (Details)
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0516 - Disclosure - Earnings (Loss) Per Share (Tables)
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06161 - Disclosure - Earnings (Loss) Per Share (Details Textual)
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0616 - Disclosure - Earnings (Loss) Per Share (Details)
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0612 - Disclosure - Benefit Plan (Details)
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06111 - Disclosure - Commitments and Off-Balance Sheet Risk (Details 1)
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06101 - Disclosure - Related Parties (Details Textual)
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0610 - Disclosure - Related Parties (Details)
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0510 - Disclosure - Related Parties (Tables)
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06095 - Disclosure - Stock-Based Compensation (Details Textual)
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06094 - Disclosure - Stock-Based Compensation (Details 4)
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06093 - Disclosure - Stock-Based Compensation (Details 3)
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06092 - Disclosure - Stock-Based Compensation (Details 2)
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06091 - Disclosure - Stock-Based Compensation (Details 1)
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0509 - Disclosure - Stock-Based Compensation (Tables)
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0609 - Disclosure - Stock-Based Compensation (Details)
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06083 - Disclosure - Federal Income Taxes (Details Textual)
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06082 - Disclosure - Federal Income Taxes (Details 2)
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06081 - Disclosure - Federal Income Taxes (Details 1)
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0608 - Disclosure - Federal Income Taxes (Details)
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0508 - Disclosure - Federal Income Taxes (Tables)
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06052 - Disclosure - Deposits (Details 2)
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06051 - Disclosure - Deposits (Details 1)
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060309 - Disclosure - Loans and Allowance for Loan Losses (Details 9)
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0601 - Disclosure - Summary of Significant Accounting Policies (Details)
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0221 - Disclosure - Quarterly Financial Data (Unaudited)
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0220 - Disclosure - Other Comprehensive Income (loss)
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0219 - Disclosure - U. S. Treasury Capital Purchase Program Participation
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0217 - Disclosure - Subordinated Debentures
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0216 - Disclosure - Earnings (Loss) Per Share
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0215 - Disclosure - Fair Value Measurements
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0210 - Disclosure - Related Parties
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0209 - Disclosure - Stock-Based Compensation
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0208 - Disclosure - Federal Income Taxes
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0613 - Disclosure - Hedging Activities (Details)
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06061 - Disclosure - Short-Term Borrowings (Details Textual)
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06181 - Disclosure - Regulatory Matters (Details Textual)
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0618 - Disclosure - Regulatory Matters (Details)
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0518 - Disclosure - Regulatory Matters (Tables)
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0615 - Disclosure - Fair Value Measurements (Details)
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0614 - Disclosure - Fair Values of Financial Instruments (Details)
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0514 - Disclosure - Fair Values of Financial Instruments (Tables)
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06112 - Disclosure - Commitments and Off-Balance Sheet Risk (Details Textual)
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0611 - Disclosure - Commitments and Off-Balance Sheet Risk (Details)
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0511 - Disclosure - Commitments and Off-Balance Sheet Risk (Tables)
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06071 - Disclosure - Federal Home Loan Bank Advances (Details Textual)
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0506 - Disclosure - Short-Term Borrowings (Tables)
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0507 - Disclosure - Federal Home Loan Bank Advances (Tables)
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0607 - Disclosure - Federal Home Loan Bank Advances (Details)
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0606 - Disclosure - Short-Term Borrowings (Details)
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06053 - Disclosure - Deposits (Details Textual)
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0605 - Disclosure - Deposits (Details)
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0505 - Disclosure - Deposits (Tables)
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06041 - Disclosure - Premises and Equipment, Net (Details Textual)
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0604 - Disclosure - Premises and Equipment, Net (Details)
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0504 - Disclosure - Premises and Equipment, Net (Tables)
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060310 - Disclosure - Loans and Allowance for Loan Losses (Details Textual)
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060308 - Disclosure - Loans and Allowance for Loan Losses (Details 8)
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060307 - Disclosure - Loans and Allowance for Loan Losses (Details 7)
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060306 - Disclosure - Loans and Allowance for Loan Losses (Details 6)
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060305 - Disclosure - Loans and Allowance for Loan Losses (Details 5)
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060304 - Disclosure - Loans and Allowance for Loan Losses (Details 4)
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060303 - Disclosure - Loans and Allowance for Loan Losses (Details 3)
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060301 - Disclosure - Loans and Allowance for Loan Losses (Details 1)
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0603 - Disclosure - Loans and Allowance for Loan Losses (Details)
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0503 - Disclosure - Loans and Allowance for Loan Losses (Tables)
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06023 - Disclosure - Securities (Details Textual)
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06022 - Disclosure - Securities (Details 2)
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06021 - Disclosure - Securities (Details 1)
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0602 - Disclosure - Securities (Details)
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0502 - Disclosure - Securities (Tables)
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0203 - Disclosure - Loans and Allowance for Loan Losses
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0141 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)
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0110 - Statement - Consolidated Balance Sheets
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0111 - Statement - Consolidated Balance Sheets (Parenthetical)
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0120 - Statement - Consolidated Statements of Operations
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0140 - Statement - Consolidated Statements of Changes in Shareholders' Equity
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0150 - Statement - Consolidated Statements of Cash Flows
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0202 - Disclosure - Securities
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0204 - Disclosure - Premises and Equipment, Net
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0205 - Disclosure - Deposits
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0206 - Disclosure - Short-Term Borrowings
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0207 - Disclosure - Federal Home Loan Bank Advances
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0211 - Disclosure - Commitments and Off-Balance Sheet Risk
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0213 - Disclosure - Hedging Activities
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0214 - Disclosure - Fair Values of Financial Instruments
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0218 - Disclosure - Regulatory Matters
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