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Condensed Parent Information, Statements of Income (FY) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
INCOME |  |  |  |  |  |  |
Interest income | $ 22,993,384 | $ 11,517,489 | $ 42,371,438 | $ 22,466,812 | $ 52,022,396 | $ 42,564,391 |
EXPENSES |  |  |  |  |  |  |
Interest expense | 3,455,362 | 1,268,821 | 6,022,096 | 2,397,784 | 5,693,353 | 4,299,682 |
Income tax benefit | (1,294,707) | (725,694) | (2,235,162) | (1,671,548) | (6,428,791) | (3,362,080) |
Net income | 3,931,556 | 1,648,286 | 7,346,326 | 3,292,138 | 5,015,064 | 5,798,808 |
Preferred stock dividend requirements | 0 | 0 | 0 | 195,000 | 195,000 | 1,022,000 | $ 120,000
Net income available to common shareholders | $ 3,931,556 | $ 1,648,286 | $ 7,346,326 | $ 3,097,138 | 4,820,064 | 4,776,808 |
Parent [Member] |  |  |  |  |  |  |
INCOME |  |  |  |  |  |  |
Dividends |  |  |  |  | 0 | 3,000,000 |
Interest income |  |  |  |  | 0 | 0 |
Interest and dividend income |  |  |  |  | 0 | 3,000,000 |
EXPENSES |  |  |  |  |  |  |
Interest expense |  |  |  |  | 69,000 | 17,000 |
Other operating expenses |  |  |  |  | 2,657,000 | 1,146,000 |
Loss before equity in undistributed earnings of subsidiaries and income tax benefit |  |  |  |  | (2,726,000) | 1,837,000 |
Equity in undistributed earnings of subsidiaries |  |  |  |  | 7,134,000 | 3,520,000 |
Income tax benefit |  |  |  |  | 607,000 | 442,000 |
Net income |  |  |  |  | 5,015,000 | 5,799,000 |
Preferred stock dividend requirements |  |  |  |  | 195,000 | 1,022,000 |
Net income available to common shareholders |  |  |  |  | $ 4,820,000 | $ 4,777,000 |

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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