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Note 6 - Business Segment Information - Selected Financial Information on the Company's Business Segments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Total revenue |  | $ 48,087,745 | $ 38,628,853 |
Net interest income |  | 32,402,918 | 27,668,883 |
Provision |  | 2,539,839 | 2,105,109 |
Net income (loss) |  | 10,549,961 | 9,184,965 |
Goodwill |  | 28,334,092 | 13,110,913 | $ 28,334,092
Core deposit intangible |  | 8,774,402 | 7,150,346 | 9,078,953
Assets, Total |  | 4,026,314,414 | 3,381,012,618 | $ 3,982,664,773
Operating Segments [Member] | Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] |  |  |  |
Total revenue |  | 15,807,570 | 13,535,941 |
Net interest income |  | 12,120,302 | 11,301,482 |
Provision |  | 1,120,409 | 931,109 |
Net income (loss) |  | 4,457,868 | 3,655,006 |
Goodwill |  | 3,222,688 | 3,222,688 |
Core deposit intangible |  |  |  |
Assets, Total |  | 1,526,829,646 | 1,442,952,197 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] |  |  |  |
Total revenue |  | 15,997,332 | 10,386,545 |
Net interest income |  | 10,835,848 | 6,974,047 |
Provision |  | 601,828 | 250,000 |
Net income (loss) |  | 4,616,528 | 2,892,560 |
Goodwill |  | 15,223,179 |  |
Core deposit intangible |  | 3,566,728 | 1,222,019 |
Assets, Total |  | 1,331,208,620 | 929,111,309 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Community State Bank [Member] |  |  |  |
Total revenue | [1] | 8,163,323 | 8,131,706 |
Net interest income | [1] | 6,743,947 | 7,026,508 |
Provision |  | 575,602 | 774,000 |
Net income (loss) | [1] | 1,868,588 | 1,895,134 |
Goodwill | [1] | 9,888,225 | 9,888,225 |
Core deposit intangible | [1] | 5,207,674 | 5,928,327 |
Assets, Total | [1] | 696,978,705 | 608,431,003 |
Operating Segments [Member] | Commercial Banking Segment [Member] | Rockford Bank and Trust [Member] |  |  |  |
Total revenue |  | 4,997,945 | 3,947,799 |
Net interest income |  | 3,465,154 | 2,968,074 |
Provision |  | 242,000 | 150,000 |
Net income (loss) |  | 741,295 | 844,569 |
Goodwill |  |  |  |
Core deposit intangible |  |  |  |
Assets, Total |  | 468,112,032 | 398,454,864 |
Operating Segments [Member] | Wealth Management Segment [Member] |  |  |  |
Total revenue |  | 3,189,425 | 2,701,806 |
Net interest income |  |  |  |
Provision |  |  |  |
Net income (loss) |  | 770,865 | 561,062 |
Goodwill |  |  |  |
Core deposit intangible |  |  |  |
Assets, Total |  |  |  |
Operating Segments [Member] | Other Segments [Member] |  |  |  |
Total revenue |  | 12,532,043 | 9,876,143 |
Net interest income |  | (762,333) | (601,228) |
Provision |  |  |  |
Net income (loss) |  | 10,514,510 | 9,184,968 |
Goodwill |  |  |  |
Core deposit intangible |  |  |  |
Assets, Total |  | 447,591,932 | 377,316,912 |
Intersegment Eliminations [Member] |  |  |  |
Total revenue |  | (12,599,893) | (9,951,087) |
Net interest income |  |  |  |
Provision |  |  |  |
Net income (loss) |  | (12,419,693) | (9,848,334) |
Goodwill |  |  |  |
Core deposit intangible |  |  |  |
Assets, Total |  | $ (444,406,521) | $ (375,253,667) |
[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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