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Securities (FY) (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |
Available-for-sale Securities |  | The amortized cost and fair value of securities available-for-sale at December 31, 2017 and 2016 are summarized as follow (in thousands):
|  | December 31, 2017
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Government-sponsored enterprises (GSEs) |  | $ | 26,207 |  |  | $ | 1 |  |  | $ | (432 | ) |  | $ | 25,776 |
Municipal securities |  | 9,122 |  |  | 28 |  |  | (147 | ) |  | 9,003 |
Other debt securities |  | 974 |  |  | — |  |  | (24 | ) |  | 950 |
Mortgage-backed securities |  | 117,263 |  |  | 136 |  |  | (1,184 | ) |  | 116,215 |
Total |  | $ | 153,566 |  |  | $ | 165 |  |  | $ | (1,787 | ) |  | $ | 151,944 |
|  | December 31, 2016
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Government-sponsored enterprises (GSEs) |  | $ | 18,279 |  |  | $ | 8 |  |  | $ | (564 | ) |  | $ | 17,723 |
Municipal securities |  | 8,182 |  |  | 16 |  |  | (179 | ) |  | 8,019 |
Mortgage-backed securities |  | 104,585 |  |  | 185 |  |  | (1,090 | ) |  | 103,680 |
Total |  | $ | 131,046 |  |  | $ | 209 |  |  | $ | (1,833 | ) |  | $ | 129,422 |
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of securities at June 30, 2018, by contractual maturity for non-mortgage backed securities, are shown below (in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | — |  |  | $ | — |
Due from one year to five years |  | 21,554 |  |  | 20,901 |
Due from five years to ten years |  | 13,995 |  |  | 13,366 |
Due after ten years |  | 10,460 |  |  | 10,356 |
|  | 46,009 |  |  | 44,623 |
Mortgage-backed securities |  | 114,538 |  |  | 111,954 |
|  | $ | 160,547 |  |  | $ | 156,577 |
| The amortized cost and estimated market value of securities at December 31, 2017, by contractual maturity, are shown below (in thousands). Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | 2,174 |  |  | $ | 2,175 |
Due from one year to five years |  | 21,606 |  |  | 21,292 |
Due from five years to ten years |  | 8,037 |  |  | 7,822 |
Due after ten years |  | 4,486 |  |  | 4,440 |
|  | 36,303 |  |  | 35,729 |
Mortgage-backed securities |  | 117,263 |  |  | 116,215 |
Total |  | $ | 153,566 |  |  | $ | 151,944 |
Schedule of Unrealized Loss on Investments | The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities available-for-sale have been in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017 (in thousands):
|  | As of June 30, 2018
|  | Less than 12 Months |  | 12 Months or Greater |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs) |  | $ | 14,862 |  |  | $ | (425 | ) |  | $ | 13,266 |  |  | $ | (584 | ) |  | $ | 28,128 |  |  | $ | (1,009 | )
Municipal securities |  | 11,966 |  |  | (182 | ) |  | 2,072 |  |  | (138 | ) |  | 14,038 |  |  | (320 | )
Other debt securities |  | — |  |  | — |  |  | 911 |  |  | (65 | ) |  | 911 |  |  | (65 | )
Mortgage-backed securities (GSEs) |  | 58,377 |  |  | (1,654 | ) |  | 29,911 |  |  | (1,101 | ) |  | 88,288 |  |  | (2,755 | )
|  | $ | 85,205 |  |  | $ | (2,261 | ) |  | $ | 46,160 |  |  | $ | (1,888 | ) |  | $ | 131,365 |  |  | $ | (4,149 | )
|  | As of December 31, 2017
|  | Less than 12 Months |  | 12 Months or Greater |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs) |  | $ | 1,358 |  |  | $ | (1 | ) |  | $ | 13,420 |  |  | $ | (431 | ) |  | $ | 14,778 |  |  | $ | (432 | )
Municipal securities |  | 3,418 |  |  | (43 | ) |  | 2,112 |  |  | (104 | ) |  | 5,530 |  |  | (147 | )
Other debt securities |  | 950 |  |  | (24 | ) |  | — |  |  | — |  |  | 950 |  |  | (24 | )
Mortgage-backed securities (GSEs) |  | 61,332 |  |  | (407 | ) |  | 35,048 |  |  | (777 | ) |  | 96,380 |  |  | (1,184 | )
|  | $ | 67,058 |  |  | $ | (475 | ) |  | $ | 50,580 |  |  | $ | (1,312 | ) |  | $ | 117,638 |  |  | $ | (1,787 | )
| The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities available-for-sale have been in a continuous unrealized loss position, as of December 31, 2017 and 2016 (in thousands):
|  | As of December 31, 2017
|  | Less than 12 Months |  | 12 Months or Greater |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs) |  | $ | 1,358 |  |  | $ | (1 | ) |  | $ | 13,420 |  |  | $ | (431 | ) |  | $ | 14,778 |  |  | $ | (432 | )
Municipal securities |  | 3,418 |  |  | (43 | ) |  | 2,112 |  |  | (104 | ) |  | 5,530 |  |  | (147 | )
Other debt securities |  | 950 |  |  | (24 | ) |  | — |  |  | — |  |  | 950 |  |  | (24 | )
Mortgage-backed securities |  | 61,332 |  |  | (407 | ) |  | 35,048 |  |  | (777 | ) |  | 96,380 |  |  | (1,184 | )
Total |  | $ | 67,058 |  |  | $ | (475 | ) |  | $ | 50,580 |  |  | $ | (1,312 | ) |  | $ | 117,638 |  |  | $ | (1,787 | )
|  | As of December 31, 2016
|  | Less than 12 Months |  | 12 Months or Greater |  | Total
|  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Government- sponsored enterprises (GSEs) |  | $ | 14,702 |  |  | $ | (564 | ) |  | $ | — |  |  | $ | — |  |  | $ | 14,702 |  |  | $ | (564 | )
Municipal securities |  | 6,368 |  |  | (179 | ) |  | — |  |  | — |  |  | 6,368 |  |  | (179 | )
Mortgage-backed securities |  | 67,063 |  |  | (690 | ) |  | 8,948 |  |  | (400 | ) |  | 76,011 |  |  | (1,090 | )
Total |  | $ | 88,133 |  |  | $ | (1,433 | ) |  | $ | 8,948 |  |  | $ | (400 | ) |  | $ | 97,081 |  |  | $ | (1,833 | )
Schedule of Available For Sale Securities and Held To Maturity Reconciliation |  | Sales of available for sale securities for the years ended December 31, 2017 and 2016, were as follows (in thousands):
|  | 2017 |  | 2016
Proceeds |  | $ | 12,614 |  |  | $ | 31,599 |
Gains realized |  | 145 |  |  | 200 |
Losses realized |  | 2 |  |  | — |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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