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Note 24 - Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Condensed Statement of Cash Flows (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 11,639,000 | $ 15,051,000 | $ 18,091,000 | $ 14,240,000 | $ 14,082,000 | $ 10,686,000 | $ 8,697,000 | $ 10,673,000 | $ 59,021,000 | $ 44,138,000 | $ 49,456,000
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 3,784,000 | 2,325,000 | 2,931,000
Stock grants to directors for retainer fees |  |  |  |  |  |  |  |  | 344,000 | 394,000 | 375,000
Other assets |  |  |  |  |  |  |  |  | (16,279,000) | (10,892,000) | (7,636,000)
Accrued interest and other liabilities |  |  |  |  |  |  |  |  | 335,000 | 1,895,000 | (2,818,000)
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Net cash for investing activities |  |  |  |  |  |  |  |  | (495,507,000) | (398,806,000) | (92,838,000)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercises, net of cashless exercises |  |  |  |  |  |  |  |  | 50,000 | 3,000 | 128,000
Employee stock purchase plan |  |  |  |  |  |  |  |  | 48,000 | 49,000 | 50,000
Dividend reinvestment plan |  |  |  |  |  |  |  |  | 877,000 | 814,000 | 729,000
Net proceeds from subordinated notes issuance |  |  |  |  |  |  |  |  | 73,635,000 | 0 | 0
Repurchases of common stock |  |  |  |  |  |  |  |  | (21,380,000) | (6,591,000) | (7,183,000)
Payment of cash dividends to common shareholders |  |  |  |  |  |  |  |  | (18,524,000) | (17,930,000) | (17,108,000)
Net cash for financing activities |  |  |  |  |  |  |  |  | 780,088,000 | 753,204,000 | 206,448,000
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 59,021,000 | 44,138,000 | 49,456,000
Adjustments to reconcile net income to net cash from operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net income of subsidiary |  |  |  |  |  |  |  |  | (26,075,000) | (17,086,000) | (33,449,000)
Stock-based compensation expense |  |  |  |  |  |  |  |  | 3,784,000 | 2,325,000 | 2,931,000
Stock grants to directors for retainer fees |  |  |  |  |  |  |  |  | 344,000 | 394,000 | 375,000
Other assets |  |  |  |  |  |  |  |  | 49,000 | (227,000) | 2,387,000
Accrued interest and other liabilities |  |  |  |  |  |  |  |  | (5,000) | 812,000 | (1,924,000)
Net cash from operating activities |  |  |  |  |  |  |  |  | 37,118,000 | 30,356,000 | 19,776,000
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Net capital investment into subsidiaries |  |  |  |  |  |  |  |  | (70,000,000) | 0 | 0
Net cash for investing activities |  |  |  |  |  |  |  |  | (70,000,000) | 0 | 0
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from stock option exercises, net of cashless exercises |  |  |  |  |  |  |  |  | 50,000 | 3,000 | 128,000
Employee stock purchase plan |  |  |  |  |  |  |  |  | 48,000 | 49,000 | 50,000
Dividend reinvestment plan |  |  |  |  |  |  |  |  | 877,000 | 814,000 | 729,000
Net proceeds from subordinated notes issuance |  |  |  |  |  |  |  |  | 73,635,000 | 0 | 0
Repurchases of common stock |  |  |  |  |  |  |  |  | (21,380,000) | (6,591,000) | (7,183,000)
Payment of cash dividends to common shareholders |  |  |  |  |  |  |  |  | (18,524,000) | (17,930,000) | (17,108,000)
Net cash for financing activities |  |  |  |  |  |  |  |  | 34,706,000 | (23,655,000) | (23,384,000)
Net change in cash and cash equivalents |  |  |  |  |  |  |  |  | 1,824,000 | 6,701,000 | (3,608,000)
Cash and cash equivalents at beginning of period |  |  |  | $ 12,746,000 |  |  |  | $ 6,045,000 | 12,746,000 | 6,045,000 | 9,653,000
Cash and cash equivalents at end of period | $ 14,570,000 |  |  |  | $ 12,746,000 |  |  |  | $ 14,570,000 | $ 12,746,000 | $ 6,045,000

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of noncontrolling interest during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from capital contributions to an entity associated with a dividend reinvestment plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
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