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Fair Value of Financial Instruments - Fair Value Roll Forward (Details) - Interest Rate Lock Commitments - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 1,724 $ 623 $ 582 $ 521
Included in net income 308 284 1,450 386
Ending balance $ 2,032 $ 907 $ 2,032 $ 907