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Fair Value Disclosures - Carrying Amount and Estimated Fair Value of Financial Instruments (Q2) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Assets: |  |  |
Securities available-for-sale, at fair value | $ 156,577,182 | $ 151,944,567 | $ 129,421,914
Restricted investments | 8,272,600 | 6,430,700 | 5,627,950
Liabilities: |  |  |
Noninterest-bearing demand deposits | 301,317,854 | 220,520,287 | 153,482,650
Interest-bearing demand deposits | 246,942,432 | 231,643,508 | 162,702,457
Time deposits | 535,879,278 | 442,774,094 | 316,275,340
Federal Home Loan Bank advances and other borrowings |  | 0 | 5,765
Level 1 [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | 170,235,000 | 113,027,000 |
Securities available-for-sale, at fair value | 0 | 0 |
Level 2 [Member] |  |  |
Assets: |  |  |
Securities available-for-sale, at fair value | 156,577,000 | 151,944,000 |
Liabilities: |  |  |
Noninterest-bearing demand deposits | 301,318,000 | 220,520,000 |
Interest-bearing demand deposits | 246,942,000 | 231,644,000 |
Money Market and Savings deposits | 632,518,000 | 543,645,000 |
Time deposits | 537,006,000 | 443,547,000 |
Securities sold under agreements to repurchase | 18,635,000 | 24,055,000 |
Federal Home Loan Bank advances and other borrowings | 72,040,000 | 43,600,000 |
Level 3 [Member] |  |  |
Assets: |  |  |
Securities available-for-sale, at fair value | 0 | 0 |
Loans, net | 1,569,916,000 | 1,292,303,000 |
Carrying Amount [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | 170,235,000 | 113,027,000 | 68,748,000
Securities available-for-sale, at fair value | 156,577,000 | 151,944,000 |
Restricted investments | 8,273,000 | 6,431,000 |
Loans, net | 1,568,361,000 | 1,317,398,000 | 808,271,000
Liabilities: |  |  |
Noninterest-bearing demand deposits | 301,318,000 | 220,520,000 |
Interest-bearing demand deposits | 246,942,000 | 231,644,000 |
Money Market and Savings deposits | 632,518,000 | 543,645,000 | 274,605,000
Time deposits | 535,879,000 | 442,774,000 |
Securities sold under agreements to repurchase | 18,635,000 | 24,055,000 | 26,622,000
Federal Home Loan Bank advances and other borrowings | 72,040,000 | 43,600,000 |
Estimated Fair Value [Member] |  |  |
Assets: |  |  |
Cash and cash equivalents | 170,235,000 | 113,027,000 | 68,748,000
Securities available-for-sale, at fair value | 156,577,000 | 151,944,000 |
Loans, net | 1,569,916,000 | 1,292,303,000 | 803,057,000
Liabilities: |  |  |
Noninterest-bearing demand deposits | 301,318,000 | 250,520,000 |
Interest-bearing demand deposits | 246,942,000 | 231,644,000 |
Money Market and Savings deposits | 632,518,000 | 543,645,000 | 274,605,000
Time deposits | 537,006,000 | 443,547,000 |
Securities sold under agreements to repurchase | 18,635,000 | 24,055,000 | $ 26,622,000
Federal Home Loan Bank advances and other borrowings | $ 72,040,000 | $ 43,600,000 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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