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Subordinated Debt (Tables)
 9 Months Ended
Sep. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Subordinated Borrowing
 
September 30, 2017
 
December 31, 2016
 
Principal
 
Unamortized Discount and Debt Issuance Costs
 
Principal
 
Unamortized Discount and Debt Issuance Costs
2021 Debenture
$
3,000

 
$
—

 
$
3,000

 
$
—

2025 Note
10,000

 
(192
)
 
10,000

 
(210
)
2026 Notes
25,000

 
(1,119
)
 
25,000

 
(1,212
)
Total
$
38,000

 
$
(1,311
)
 
$
38,000

 
$
(1,422
)