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Condensed Parent Information, Statements of Cash Flows (FY) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 06, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |
Net income |  | $ 3,931,556 | $ 1,648,286 | $ 7,346,326 | $ 3,292,138 | $ 5,015,064 | $ 5,798,808
Adjustments to reconcile net income to net cash used in operating activities: |  |  |  |  |  |  |
Other |  |  |  | 1,869,609 | 1,457,176 | (102,663) | 3,918,803
Net cash provided by operating activities |  |  |  | 12,197,707 | 5,641,998 | 6,642,301 | 11,590,741
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |  |  |  |
Redemption of preferred stock |  |  |  | 0 | (12,000,000) | (12,000,000) | 0
Proceeds from issuance of common stock |  |  |  | 1,079,979 | 37,591,479 | 37,852,113 | 803,957
Payment of dividends on preferred stock | $ (195,000) |  |  | 0 | (195,000) | (195,000) | (752,000)
Net cash provided by financing activities |  |  |  | 95,510,265 | 50,897,399 | 93,772,547 | 31,506,275
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  | (50,499,746) | (42,452,279) | (56,136,272) | (54,313,341)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  | 57,208,226 | 14,087,118 | 44,278,576 | (11,216,325)
CASH AND CASH EQUIVALENTS, beginning of year |  |  |  | 113,026,884 | 68,748,308 | 68,748,308 | 79,964,633
CASH AND CASH EQUIVALENTS, end of year |  | $ 170,235,110 | $ 82,835,426 | 170,235,110 | 82,835,426 | 113,026,884 | 68,748,308
Parent [Member] |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |
Net income |  |  |  |  |  | 5,015,000 | 5,799,000
Adjustments to reconcile net income to net cash used in operating activities: |  |  |  |  |  |  |
Equity in undistributed income of subsidiary |  |  |  |  |  | (7,134,000) | (3,520,000)
Other |  |  |  |  |  | (2,449,000) | 1,234,000
Net cash provided by operating activities |  |  |  |  |  | (4,568,000) | 3,513,000
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |  |  |  |
Proceeds from issuance of note payable |  |  |  |  |  | 10,000,000 | 0
Repayment of note payable |  |  |  |  |  | 0 | (2,000,000)
Redemption of preferred stock |  |  |  |  |  | (12,000,000) | 0
Proceeds from issuance of common stock |  |  |  |  |  | 37,853,000 | 804,000
Payment of dividends on preferred stock |  |  |  |  |  | (195,000) | (752,000)
Net cash provided by financing activities |  |  |  |  |  | 35,658,000 | (1,948,000)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |
Net cash for purchase of Capstone Bancshares, Inc. |  |  |  |  |  | (14,222,000) | 0
Capital injection in subsidiary |  |  |  |  |  | (15,000,000) |
Net cash used in investing activities |  |  |  |  |  | (29,222,000) | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS |  |  |  |  |  | 1,868,000 | 1,565,000
CASH AND CASH EQUIVALENTS, beginning of year |  |  |  | $ 3,936,000 | $ 2,068,000 | 2,068,000 | 503,000
CASH AND CASH EQUIVALENTS, end of year |  |  |  |  |  | $ 3,936,000 | $ 2,068,000

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