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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Total revenue |  |  |  |  |  |  |  |  | $ 224,420,336 | $ 165,999,610 | $ 137,502,624 |
Net interest income | $ 39,594,688 | $ 38,313,483 | $ 32,084,496 | $ 32,402,918 | $ 31,793,353 | $ 28,556,348 | $ 28,046,697 | $ 27,668,883 | 142,395,585 | 116,065,281 | 94,516,777 |
Provision for loan/lease losses | 1,612,047 | 6,205,828 | 2,300,735 | 2,539,839 | 2,255,381 | 2,086,436 | 2,022,993 | 2,105,109 | 12,658,449 | 8,469,919 | 7,478,166 |
Net income | 13,315,518 | $ 8,808,835 | $ 10,445,385 | $ 10,549,961 | 9,901,590 | $ 7,853,935 | $ 8,766,017 | $ 9,184,965 | 43,119,699 | 35,706,507 | 27,686,787 |
Goodwill | 77,831,902 |  |  |  | 28,334,092 |  |  |  | 77,831,902 | 28,334,092 | 13,110,913 | $ 3,222,688
Core deposit intangible | 17,450,182 |  |  |  | 9,078,953 |  |  |  | 17,450,182 | 9,078,953 | 7,381,213 |
Total assets | 4,949,710,195 |  |  |  | 3,982,664,773 |  |  |  | 4,949,710,195 | 3,982,664,773 | 3,301,943,748 |
Net income (loss) |  |  |  |  |  |  |  |  | 43,119,699 | 35,706,507 | 27,686,787 |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | (871,470) | (499,520) | 4,100,975 |
Total assets | (26,387,315) |  |  |  | (26,924,088) |  |  |  | (26,387,315) | (26,924,088) | (33,126,711) |
Guaranty Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 1,806,078 |  |
Net interest income |  |  |  |  |  |  |  |  |  | 1,551,356 |  |
Net income |  |  |  |  |  |  |  |  |  | 346,835 |  |
Rockford Bank and Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 20,848,171 | 18,035,971 | 16,043,894 |
Net interest income |  |  |  |  |  |  |  |  | 13,638,969 | 12,707,651 | 11,887,201 |
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 4,618,833 | 728,000 | 900,000 |
Net income |  |  |  |  |  |  |  |  | 667,809 | 2,660,364 | 3,235,711 |
Total assets | 509,621,731 |  |  |  | 461,650,765 |  |  |  | 509,621,731 | 461,650,765 | 391,154,780 |
SPRINGFIELD BANCSHARES, INC |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 15,153,047 |  |  |
Net interest income |  |  |  |  |  |  |  |  | 11,834,782 |  |  |
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 990,000 |  |  |
Net income |  |  |  |  |  |  |  |  | 4,816,326 |  |  |
Goodwill | 45,974,931 |  |  |  |  |  |  |  | 45,974,931 |  |  |
Core deposit intangible | 7,734,501 |  |  |  |  |  |  |  | 7,734,501 |  |  |
Total assets | 632,849,228 |  |  |  |  |  |  |  | 632,849,228 |  |  |
Commercial Banking Segment [Member] | Quad City Bank and Trust Company [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 69,691,414 | 58,055,715 | 59,442,052 |
Net interest income |  |  |  |  |  |  |  |  | 48,682,464 | 46,407,078 | 45,081,080 |
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 3,692,928 | 3,908,919 | 4,168,166 |
Net income |  |  |  |  |  |  |  |  | 18,346,840 | 22,095,055 | 14,116,751 |
Goodwill | 3,222,688 |  |  |  | 3,222,688 |  |  |  | 3,222,688 | 3,222,688 | 3,222,688 |
Total assets | 1,623,368,583 |  |  |  | 1,541,777,558 |  |  |  | 1,623,368,583 | 1,541,777,558 | 1,395,785,241 |
Commercial Banking Segment [Member] | Cedar Rapids Bank and Trust [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 69,864,300 | 45,367,035 | 37,242,901 |
Net interest income |  |  |  |  |  |  |  |  | 43,038,038 | 31,042,302 | 29,205,047 |
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 1,833,226 | 1,050,000 | 950,000 |
Net income |  |  |  |  |  |  |  |  | 20,044,067 | 10,712,174 | 12,317,545 |
Goodwill | 14,979,984 |  |  |  | 15,223,179 |  |  |  | 14,979,984 | 15,223,179 |  |
Core deposit intangible | 3,186,136 |  |  |  | 3,693,592 |  |  |  | 3,186,136 | 3,693,592 | 1,271,897 |
Total assets | 1,379,222,278 |  |  |  | 1,307,376,687 |  |  |  | 1,379,222,278 | 1,307,376,687 | 913,055,738 |
Commercial Banking Segment [Member] | Community State Bank [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 36,069,287 | 31,944,152 | 11,406,291 |
Net interest income |  |  |  |  |  |  |  |  | 28,762,834 | 27,020,674 | 10,004,729 |
Provision for loan/lease losses |  |  |  |  |  |  |  |  | 1,523,462 | 2,783,000 | 1,460,000 |
Net income |  |  |  |  |  |  |  |  | 8,389,007 | 7,047,671 | 2,132,252 |
Goodwill | 9,888,225 |  |  |  | 9,888,225 |  |  |  | 9,888,225 | 9,888,225 | 9,888,225 |
Core deposit intangible | 4,674,613 |  |  |  | 5,385,361 |  |  |  | 4,674,613 | 5,385,361 | 6,109,316 |
Total assets | 785,363,891 |  |  |  | 670,516,373 |  |  |  | 785,363,891 | 670,516,373 | 600,075,798 |
Wealth Management Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 13,432,963 | 11,057,519 | 9,156,948 |
Net income |  |  |  |  |  |  |  |  | 2,951,991 | 2,241,494 | 1,665,453 |
Other Segments [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 232,624 | 232,660 | 109,563 |
Net interest income |  |  |  |  |  |  |  |  | (3,561,502) | (2,663,780) | (1,661,280) |
Net income |  |  |  |  |  |  |  |  | (12,096,341) | (9,397,086) | (5,780,925) |
Goodwill | 3,766,074 |  |  |  |  |  |  |  | 3,766,074 |  |  |
Core deposit intangible | 1,854,932 |  |  |  |  |  |  |  | 1,854,932 |  |  |
Total assets | $ 45,671,799 |  |  |  | $ 28,267,478 |  |  |  | $ 45,671,799 | $ 28,267,478 | $ 34,998,902 |

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