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Repurchase Reserve Liability (Tables)
 12 Months Ended
Dec. 31, 2015
Repurchase Reserve Liability [Abstract]  
Schedule of repurchase reserve liability
(in thousands)
 ​ ​
2015
 ​ ​
2014
 ​ ​
2013
 ​
Balance at beginning of year
 ​ ​ ​ $ 160 ​ ​ ​ ​ $ 160 ​ ​ ​ ​ $ 0 ​ ​
Provision for repurchase liability ​ ​ ​ ​ 40 ​ ​ ​ ​ ​ 0 ​ ​ ​ ​ ​ 279 ​ ​
Reimbursement of expenses ​ ​ ​ ​ (40) ​ ​ ​ ​ ​ 0 ​ ​ ​ ​ ​ (119) ​ ​
Balance at end of year
 ​ ​ ​ $ 160 ​ ​ ​ ​ $ 160 ​ ​ ​ ​ $ 160 ​ ​
​