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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

 
—