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Summary of Significant Accounting Policies (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
Accounting Policies [Line Items] |  |  |  |  |  |
Federal Reserve Bank, reserve requirement |  |  |  |  | $ 16,546,000 | $ 15,208,000
Foreclosed assets | $ 3,524,239 |  | $ 3,524,239 |  | 3,254,392 | 2,386,239
Amortization of intangible assets | 228,866 | $ 61,071 | 416,623 | $ 113,648 | 346,435 | 305,452
Impairment of intangible assets |  |  |  |  | 0 |
Advertising Expense | 214,632 | $ 129,398 | 399,107 | $ 293,659 | 637,600 | 615,751
Residential Real Estate [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Foreclosed assets | $ 1,140,000 |  | $ 1,140,000 |  | 545,750 | 1,500
Mortgage loans in process of foreclosure |  |  |  |  | $ 0 | $ 0
Minimum [Member] | Building and Leasehold Improvements [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  |  |  |  | 15 years |
Minimum [Member] | Furniture and Equipment [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  |  |  |  | 3 years |
Maximum [Member] | Building and Leasehold Improvements [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  |  |  |  | 40 years |
Maximum [Member] | Furniture and Equipment [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life |  |  |  |  | 7 years |

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- Definition Amount of cash or deposit reserve required to be maintained with federal reserve bank. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522 + Details
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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL49126937-111524 + Details
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