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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Assets    
Collateral pledged $ 2,949 $ 675
State tax credits held for sale 1,274 3,585
Payments of Debt Issuance Costs $ 1,169 $ 1,267
Shareholders' equity:    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 23,754,814 20,306,353
Treasury stock, shares 691,673 261,718