Loans Held for Investment - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) area grade	Dec. 31, 2015 USD ($)
Receivables [Abstract]
Secured loans limit to one borrower	$ 128,400
Unsecured loans limit to one borrower	77,000
Aggregate outstanding balance of loans to one borrower of secured credit	40,000
Total purchase credit impaired	7,953
Purchased credit impaired loans, nonaccrual status	580,000
Nonaccruing loans	$ 3,481	$ 2,736
Number of areas where the entity's credit quality is maintained and credit risk managed | area	2
Number of Pass scale grades | grade	6