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Mercantile Bank Corporation (Parent Company Only) Condensed Financial Statements - Summary of condensed statements of Cash Flows (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities      
Net income $ 17,033,000 $ 12,535,000 $ 37,485,000
Adjustments to reconcile net income to net cash from (for) operating activities:      
Stock-based compensation expense 473,000 54,000 61,000
Change in other assets 8,465,000 (1,805,000) 2,771,000
Change in other liabilities (269,000) 2,257,000 (1,187,000)
Net cash from operating activities 28,507,000 17,021,000 22,506,000
Cash flows from investing activities      
Net cash for investing activities (12,419,000) 66,730,000 227,722,000
Cash flows from financing activities      
Repurchase of preferred stock 0 (21,000,000) 0
Repurchase of common stock warrant 0 (7,465,000) 0
Stock option exercises, net of cashless exercises 289,000 227,000 55,000
Employee stock purchase plan 19,000 39,000 42,000
Dividend reinvestment plan 33,000 14,000 6,000
Cash dividends on preferred stock 0 (496,000) (1,620,000)
Cash dividends on common stock (3,889,000) (774,000) 0
Net cash for financing activities (5,126,000) (24,120,000) (238,054,000)
Net change in cash and cash equivalents 10,962,000 59,631,000 12,174,000
Parent Company [Member]
      
Cash flows from operating activities      
Net income 17,033,000 12,535,000 37,485,000
Adjustments to reconcile net income to net cash from (for) operating activities:      
Equity in undistributed (income) loss of subsidiary (14,461,000) 18,730,000 (32,145,000)
Stock-based compensation expense 473,000 54,000 61,000
Change in other assets 3,244,000 (3,006,000) (3,619,000)
Change in other liabilities (708,000) 1,073,000 (956,000)
Net cash from operating activities 5,581,000 29,386,000 826,000
Cash flows from investing activities      
Net capital investment into subsidiaries 0 0 0
Net cash for investing activities 0 0 0
Cash flows from financing activities      
Repurchase of preferred stock 0 (21,000,000) 0
Repurchase of common stock warrant 0 (7,465,000) 0
Stock option exercises, net of cashless exercises 289,000 227,000 55,000
Employee stock purchase plan 19,000 39,000 42,000
Dividend reinvestment plan 33,000 14,000 6,000
Cash dividends on preferred stock 0 (496,000) (1,620,000)
Cash dividends on common stock (3,889,000) (774,000) 0
Net cash for financing activities (3,548,000) (29,455,000) (1,517,000)
Net change in cash and cash equivalents 2,033,000 (69,000) (691,000)
Cash and cash equivalents at beginning of period 473,000 542,000 1,233,000
Cash and cash equivalents at end of period $ 2,506,000 $ 473,000 $ 542,000