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Note 22 - Business Segment Information - Selected Financial Information on the Company's Business Segments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total revenue |  |  |  |  |  |  |  |  |  | $ 165,999,610 | $ 137,502,624 | $ 114,366,574
Net interest income |  | $ 31,793,353 | $ 28,556,348 | $ 28,046,697 | $ 27,668,883 | $ 29,279,665 | $ 23,630,777 | $ 21,008,813 | $ 20,597,522 | 116,065,281 | 94,516,777 | 76,296,724
Provision for loan/lease losses |  | 2,255,381 | 2,086,436 | 2,022,993 | 2,105,109 | 2,599,345 | 1,607,986 | 1,197,850 | 2,072,985 | 8,469,919 | 7,478,166 | 6,870,900
Net income (loss) |  | 9,901,590 | $ 7,853,935 | $ 8,766,017 | $ 9,184,965 | 8,529,330 | $ 6,107,501 | $ 6,676,467 | $ 6,373,489 | 35,706,507 | 27,686,787 | 16,927,881
Goodwill |  | 28,334,092 |  |  |  | 13,110,913 |  |  |  | 28,334,092 | 13,110,913 | 3,222,688
Core deposit intangible |  | 9,078,953 |  |  |  | 7,381,213 |  |  |  | 9,078,953 | 7,381,213 | 1,471,409
Total assets |  | 3,982,664,773 |  |  |  | 3,301,943,748 |  |  |  | 3,982,664,773 | 3,301,943,748 | 2,593,198,275
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 16,927,881
Operating Segments [Member] | Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 58,055,715 | 59,442,052 | 52,914,705
Net interest income |  |  |  |  |  |  |  |  |  | 46,407,078 | 45,081,080 | 40,416,563
Provision for loan/lease losses |  |  |  |  |  |  |  |  |  | 3,908,919 | 4,168,166 | 4,367,234
Net income (loss) |  |  |  |  |  |  |  |  |  | 22,095,055 | 14,116,751 |
Goodwill |  | 3,222,688 |  |  |  | 3,222,688 |  |  |  | 3,222,688 | 3,222,688 | 3,222,688
Core deposit intangible |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | 1,541,777,558 |  |  |  | 1,395,785,241 |  |  |  | 1,541,777,558 | 1,395,785,241 | 1,336,571,694
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 10,333,111
Operating Segments [Member] | Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 45,367,035 | 37,242,901 | 37,593,652
Net interest income |  |  |  |  |  |  |  |  |  | 31,042,302 | 29,205,047 | 26,635,659
Provision for loan/lease losses |  |  |  |  |  |  |  |  |  | 1,050,000 | 950,000 | 1,750,000
Net income (loss) |  |  |  |  |  |  |  |  |  | 10,712,174 | 12,317,545 |
Goodwill |  | 15,223,179 |  |  |  |  |  |  |  | 15,223,179 |  |
Core deposit intangible |  | 3,693,592 |  |  |  | 1,271,897 |  |  |  | 3,693,592 | 1,271,897 | 1,471,409
Total assets |  | 1,307,376,687 |  |  |  | 913,055,738 |  |  |  | 1,307,376,687 | 913,055,738 | 866,872,406
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 7,695,867
Operating Segments [Member] | Commercial Banking Segment [Member] | Guaranty Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [1] |  |  |  |  |  |  |  |  | 1,806,078 |  |
Net interest income | [1] |  |  |  |  |  |  |  |  | 1,551,356 |  |
Provision for loan/lease losses | [1] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [1] |  |  |  |  |  |  |  |  | 346,835 |  |
Goodwill | [1] |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible | [1] |  |  |  |  |  |  |  |  |  |  |
Total assets | [1] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | [1] |  |  |  |  |  |  |  |  |  |  |
Operating Segments [Member] | Commercial Banking Segment [Member] | Community State Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 31,944,152 | 11,406,291 |
Net interest income |  |  |  |  |  |  |  |  |  | 27,020,674 | 10,004,729 |
Provision for loan/lease losses |  |  |  |  |  |  |  |  |  | 2,783,000 | 1,460,000 |
Net income (loss) |  |  |  |  |  |  |  |  |  | 7,047,671 | 2,132,252 |
Goodwill |  | 9,888,225 |  |  |  | 9,888,225 |  |  |  | 9,888,225 | 9,888,225 |
Core deposit intangible |  | 5,385,361 |  |  |  | 6,109,316 |  |  |  | 5,385,361 | 6,109,316 |
Total assets |  | 670,516,373 |  |  |  | 600,075,798 |  |  |  | 670,516,373 | 600,075,798 |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |
Operating Segments [Member] | Commercial Banking Segment [Member] | Rockford Bank and Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 18,035,971 | 16,043,894 | 14,816,300
Net interest income |  |  |  |  |  |  |  |  |  | 12,707,651 | 11,887,201 | 10,854,637
Provision for loan/lease losses |  |  |  |  |  |  |  |  |  | 728,000 | 900,000 | 753,666
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,660,364 | 3,235,711 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | 461,650,765 |  |  |  | 391,154,780 |  |  |  | 461,650,765 | 391,154,780 | 367,471,639
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 2,402,522
Operating Segments [Member] | Wealth Management Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 11,057,519 | 9,156,948 | 9,103,173
Net interest income |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,241,494 | 1,665,453 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | 1,627,586
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 232,660 | 109,563 | 363,432
Net interest income |  |  |  |  |  |  |  |  |  | (2,663,780) | (1,661,280) | (1,610,135)
Provision for loan/lease losses |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (9,397,086) | (5,780,925) |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | 28,267,478 |  |  |  | 34,998,902 |  |  |  | 28,267,478 | 34,998,902 | 27,605,704
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  | (5,131,205)
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | (499,520) | 4,100,975 | (424,688)
Net interest income |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan/lease losses |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | $ (26,924,088) |  |  |  | $ (33,126,711) |  |  |  | $ (26,924,088) | $ (33,126,711) | (5,323,168)
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |
[1] | Represents financial results for Guaranty Bank for the period from October 1, 2017 through December 2, 2017, when Guaranty Bank was merged into CRBT.

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