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Note 6 - Business Segment Information - Selected Financial Information on the Company's Business Segments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Total assets | $ 3,457,186,695 | $ 2,683,434,288 | $ 3,457,186,695 | $ 2,683,434,288 | $ 3,301,943,748
Total revenue | 39,235,786 | 30,675,685 | 77,864,639 | 61,000,217 |
Net interest income | 28,046,697 | 21,008,813 | 55,715,580 | 41,606,335 |
Provision for loan/lease losses | 2,022,993 | 1,197,850 | 4,128,102 | 3,270,835 |
Net income (loss) | 8,766,017 | 6,676,467 | 17,950,982 | 13,049,956 |
Goodwill | 13,110,913 | 3,222,688 | 13,110,913 | 3,222,688 | 13,110,913
Core deposit intangible | 6,919,480 | 1,371,653 | 6,919,480 | 1,371,653 | $ 7,381,213
Operating Segments [Member] | Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |
Total assets | 1,400,307,827 | 1,390,025,232 | 1,400,307,827 | 1,390,025,232 |
Total revenue | 14,210,040 | 14,162,914 | 27,745,981 | 27,679,846 |
Net interest income | 11,414,818 | 11,207,759 | 22,716,300 | 22,169,206 |
Provision for loan/lease losses | 552,993 | 747,850 | 1,484,102 | 1,970,835 |
Net income (loss) | 4,073,777 | 3,898,343 | 7,728,783 | 6,730,039 |
Goodwill | 3,222,688 | 3,222,688 | 3,222,688 | 3,222,688 |
Core deposit intangible |  |  |  |  |
Operating Segments [Member] | Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] |  |  |  |  |
Total assets | 993,768,912 | 904,367,275 | 993,768,912 | 904,367,275 |
Total revenue | 10,149,769 | 10,438,092 | 20,536,314 | 21,277,313 |
Net interest income | 7,230,425 | 7,135,725 | 14,204,472 | 14,160,713 |
Provision for loan/lease losses | 300,000 | 150,000 | 550,000 | 700,000 |
Net income (loss) | 2,870,582 | 3,144,986 | 5,763,142 | 6,079,717 |
Goodwill |  |  |  |  |
Core deposit intangible | 1,172,141 | 1,371,653 | 1,172,141 | 1,371,653 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Community State Bank [Member] |  |  |  |  |
Total assets | 642,761,140 |  | 642,761,140 |  |
Total revenue | 8,171,307 |  | 16,303,013 |  |
Net interest income | 6,920,820 |  | 13,947,328 |  |
Provision for loan/lease losses | 861,000 |  | 1,635,000 |  |
Net income (loss) | 1,920,040 |  | 3,815,174 |  |
Goodwill | 9,888,225 |  | 9,888,225 |  |
Core deposit intangible | 5,747,339 |  | 5,747,339 |  |
Operating Segments [Member] | Commercial Banking Segment [Member] | Rockford Bank and Trust [Member] |  |  |  |  |
Total assets | 426,159,677 | 402,157,473 | 426,159,677 | 402,157,473 |
Total revenue | 4,241,431 | 3,918,629 | 8,189,230 | 7,712,876 |
Net interest income | 3,095,512 | 2,945,417 | 6,063,586 | 5,857,391 |
Provision for loan/lease losses | 309,000 | 300,000 | 459,000 | 600,000 |
Net income (loss) | 834,842 | 772,169 | 1,679,411 | 1,389,954 |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |
Operating Segments [Member] | Wealth Management Segment [Member] |  |  |  |  |
Total assets |  |  |  |  |
Total revenue | 2,560,836 | 2,204,821 | 5,262,642 | 4,439,113 |
Net interest income |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |
Net income (loss) | 454,465 | 386,202 | 1,015,527 | 833,972 |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |
Total assets | 382,407,292 | 328,099,700 | 382,407,292 | 328,099,700 |
Total revenue | 10,181,814 | 8,244,495 | 20,057,957 | 15,104,270 |
Net interest income | (614,878) | (280,088) | (1,216,106) | (580,975) |
Provision for loan/lease losses |  |  |  |  |
Net income (loss) | 8,766,014 | 6,676,467 | 17,950,982 | 13,049,955 |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |
Intersegment Eliminations [Member] |  |  |  |  |
Total assets | (388,218,153) | (341,215,392) | (388,218,153) | (341,215,392) |
Total revenue | (10,279,411) | (8,293,266) | (20,230,498) | (15,213,201) |
Net interest income |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |
Net income (loss) | (10,153,703) | (8,201,700) | (20,002,037) | (15,033,681) |
Goodwill |  |  |  |  |
Core deposit intangible |  |  |  |  |

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