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Note 7 - Business Segment Information - Selected Financial Information on the Company's Business Segments (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Total revenue | $ 49,710,480 |  | $ 39,235,786 |  | $ 97,798,225 | $ 77,864,639 |
Net interest income | 32,084,496 |  | 28,046,697 |  | 64,487,414 | 55,715,580 |
Provision for loan/lease losses | 2,300,735 |  | 2,022,993 |  | 4,840,574 | 4,128,102 |
Net income | 10,445,385 | $ 10,549,961 | 8,766,017 | $ 9,184,965 | 20,995,346 | 17,950,982 |
Goodwill | 28,090,897 |  | 13,110,913 |  | 28,090,897 | 13,110,913 | $ 28,334,092
Core deposit intangible | 8,469,851 |  | 6,919,480 |  | 8,469,851 | 6,919,480 | 9,078,953
Total assets | 4,106,882,705 |  | 3,457,186,695 |  | 4,106,882,705 | 3,457,186,695 | $ 3,982,664,773
Operating Segments [Member] | Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |  |  |
Total revenue | 16,682,874 |  | 14,210,040 |  | 32,490,444 | 27,745,981 |
Net interest income | 12,290,034 |  | 11,414,818 |  | 24,410,336 | 22,716,300 |
Provision for loan/lease losses | 1,254,493 |  | 552,993 |  | 2,374,902 | 1,484,102 |
Net income | 4,510,902 |  | 4,073,777 |  | 8,968,770 | 7,728,783 |
Goodwill | 3,222,688 |  | 3,222,688 |  | 3,222,688 | 3,222,688 |
Total assets | 1,563,643,434 |  | 1,400,307,827 |  | 1,563,643,434 | 1,400,307,827 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] |  |  |  |  |  |  |
Total revenue | 16,503,977 |  | 10,149,769 |  | 32,501,309 | 20,536,314 |
Net interest income | 10,481,055 |  | 7,230,425 |  | 21,316,903 | 14,204,472 |
Provision for loan/lease losses | 627,742 |  | 300,000 |  | 1,229,570 | 550,000 |
Net income | 4,705,042 |  | 2,870,582 |  | 9,321,570 | 5,763,142 |
Goodwill | 14,979,984 |  |  |  | 14,979,984 |  |
Core deposit intangible | 3,439,864 |  | 1,172,141 |  | 3,439,864 | 1,172,141 |
Total assets | 1,345,431,093 |  | 993,768,912 |  | 1,345,431,093 | 993,768,912 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Community State Bank [Member] |  |  |  |  |  |  |
Total revenue | 8,406,295 |  | 8,171,307 |  | 16,569,618 | 16,303,013 |
Net interest income | 6,734,510 |  | 6,920,820 |  | 13,478,457 | 13,947,328 |
Provision for loan/lease losses | 221,000 |  | 861,000 |  | 796,602 | 1,635,000 |
Net income | 2,158,347 |  | 1,920,040 |  | 4,026,935 | 3,815,174 |
Goodwill | 9,888,225 |  | 9,888,225 |  | 9,888,225 | 9,888,225 |
Core deposit intangible | 5,029,987 |  | 5,747,339 |  | 5,029,987 | 5,747,339 |
Total assets | 712,138,515 |  | 642,761,140 |  | 712,138,515 | 642,761,140 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Rockford Bank and Trust [Member] |  |  |  |  |  |  |
Total revenue | 5,119,916 |  | 4,241,431 |  | 10,117,861 | 8,189,230 |
Net interest income | 3,401,849 |  | 3,095,512 |  | 6,867,003 | 6,063,586 |
Provision for loan/lease losses | 197,500 |  | 309,000 |  | 439,500 | 459,000 |
Net income | 813,623 |  | 834,842 |  | 1,554,918 | 1,679,411 |
Total assets | 484,123,277 |  | 426,159,677 |  | 484,123,277 | 426,159,677 |
Operating Segments [Member] | Wealth Management Segment [Member] |  |  |  |  |  |  |
Total revenue | 3,115,653 |  | 2,560,836 |  | 6,305,078 | 5,262,642 |
Net income | 796,911 |  | 454,465 |  | 1,567,776 | 1,015,527 |
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |
Total revenue | 13,024,443 |  | 10,181,814 |  | 25,556,486 | 20,057,957 |
Net interest income | (822,952) |  | (614,878) |  | (1,585,285) | (1,216,106) |
Net income | 10,405,693 |  | 8,766,014 |  | 20,920,203 | 17,950,982 |
Total assets | 463,206,792 |  | 382,407,292 |  | 463,206,792 | 382,407,292 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |
Total revenue | (13,142,678) |  | (10,279,411) |  | (25,742,571) | (20,230,498) |
Net income | (12,945,133) |  | (10,153,703) |  | (25,364,826) | (20,002,037) |
Total assets | $ (461,660,406) |  | $ (388,218,153) |  | $ (461,660,406) | $ (388,218,153) |

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