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4. Debt (Tables)
 6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Debt Outstanding
            Amount Outstanding at  
            June 30,     December 31,  
            2017     2016  
            (In thousands)  
Description   Interest Rate   Revolving Maturity            
                     
Warehouse lines of credit   5.50% over one month Libor (Minimum 6.50%)   April 2019   $ 60,602     $ 64,352  
                         
    5.50% over one month Libor (Minimum 6.25%)   August 2018     41,539       26,445  
                         
    6.75% over a commercial paper rate (Minimum 7.75%)   November 2017     30,853       14,168  
                         
Subordinated renewable notes   Weighted average rate of 7.55% and 7.50% at June 30, 2017 and December 31, 2016 , respectively   Weighted average maturity of July 2019 and January 2019 at June 30, 2017 and December 31, 2016, respectively     16,080       14,949  
                         
            $ 149,074     $ 119,914