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Note 2 - Community National Bancorporation and Community National Bank (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure Text Block Supplement [Abstract] |
Core Deposit [Table Text Block] |
|  | 2015 |  |  | 2014 |
Balance, beginning |  | $ | 1,670,921 |  |  | $ | 1,870,433 |
Amortization expense |  |  | (199,512 | ) |  |  | (199,512 | )
Balance, ending |  | $ | 1,471,409 |  |  | $ | 1,670,921 |
|  | 2015 |  |  | 2014 |
Gross carrying amount |  | $ | 1,995,127 |  |  | $ | 1,995,127 |
Accumulated amortization |  |  | (523,718 | ) |  |  | (324,206 | )
Net carrying amount |  | $ | 1,471,409 |  |  | $ | 1,670,921 |
Schedule of Business Acquisitions, by Acquisition [Table Text Block] |
|  | As of May 13, 2013 |
ASSETS |  |  |  |
Cash and due from banks |  | $ | 9,286,757 |
Federal funds sold |  |  | 12,335,000 |
Interest-bearing deposits at financial institutions |  |  | 2,024,539 |
Securities available for sale |  |  | 45,853,826 |
Loans/leases receivable, net |  |  | 195,658,486 |
Premises and equipment |  |  | 8,132,021 |
Core deposit intangible |  |  | 3,440,076 |
Bank-owned life insurance |  |  | 4,595,529 |
Restricted investment securities |  |  | 1,259,375 |
Other real estate owned |  |  | 550,326 |
Other assets |  |  | 5,178,583 |
Total assets acquired |  | $ | 288,314,518 |
LIABILITIES |  |  |  |
Deposits |  | $ | 255,045,071 |
Other borrowings |  |  | 3,950,000 |
Junior subordinated debentures |  |  | 4,125,175 |
Other liabilities |  |  | 3,911,053 |
Total liabilities assumed |  | $ | 267,031,299 |
Net assets acquired |  | $ | 21,283,219 |
CONSIDERATION PAID: |  |  |  |
Cash |  | $ | 6,261,684 |
Issuance of 834,715 shares of common stock |  |  | 13,180,150 |
Total consideration paid |  | $ | 19,441,834 |
Bargain purchase gain |  | $ | 1,841,385 |
Business Acquisition, Pro Forma Information [Table Text Block] |
|  | Year ended December 31, |
|  | 2013 |
Interest income |  | $ | 83,008,255 |
Noninterest income |  | $ | 22,042,194 |
Net income |  | $ | 11,320,890 |
Net income attributable to QCR Holdings, Inc. common stockholders |  | $ | 8,152,588 |
Earnings per common share attributable to QCR Holdings, Inc. common stockholders |  |  |  |
Basic |  | $ | 1.47 |
Diluted |  | $ | 1.44 |
Disposal Groups, Including Discontinued Operations [Table Text Block] |
ASSETS |  | As of October 4, 2013 |
Cash |  | $ | 29,905,991 |
Loans receivable |  |  | 22,709,735 |
Premises and equipment |  |  | 776,782 |
Core deposit intangible |  |  | 910,415 |
Other assets |  |  | 68,456 |
Total assets sold |  | $ | 54,371,379 |
LIABILITIES |  |  |  |
Deposits |  | $ | 55,191,930 |
Other liabilities |  |  | 53,421 |
Total liabilities sold |  | $ | 55,245,351 |
Gain on sale, pre-tax |  | $ | 873,972 |
ASSETS |  | As of October 11, 2013 |
Cash |  | $ | 519,627 |
Loans receivable |  |  | 31,749,135 |
Premises and equipment |  |  | 1,597,040 |
Core deposit intangible |  |  | 480,347 |
Other assets |  |  | 70,443 |
Total assets sold |  | $ | 34,416,592 |
LIABILITIES |  |  |  |
Deposits |  | $ | 35,830,168 |
Other liabilities |  |  | 46,668 |
Total liabilities sold |  | $ | 35,876,836 |
Gain on sale, pre-tax |  | $ | 1,460,244 |

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