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Subordinated Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Subordinated Borrowing
 
June 30, 2018
 
December 31, 2017
 
Principal
 
Unamortized Discount and Debt Issuance Costs
 
Principal
 
Unamortized Discount and Debt Issuance Costs
2021 Debenture
$
—

 
$
—

 
$
3,000

 
$
—

2025 Note
10,000

 
(174
)
 
10,000

 
(186
)
2026 Notes
25,000

 
(1,026
)
 
25,000

 
(1,088
)
Total
$
35,000

 
$
(1,200
)
 
$
38,000

 
$
(1,274
)