Loans Held for Investment - Accretable Yield Roll Forward (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Accretable yield on purchased credit impaired
Balance at the beginning of period	$ 2,726
Accretable yield at acquisition	788
Accretion	(276)
Disposals and other	(449)
Change in accretable yield	192
Balance at the end of period	2,981
Canyon National
Accretable yield on purchased credit impaired
Balance at the beginning of period	1,130
Accretable yield at acquisition	0
Accretion	(98)
Disposals and other	(30)
Change in accretable yield	0
Balance at the end of period	1,002
IDPK
Accretable yield on purchased credit impaired
Balance at the beginning of period	1,596
Accretable yield at acquisition	0
Accretion	(8)
Disposals and other	(419)
Change in accretable yield	192
Balance at the end of period	1,361
SCAF
Accretable yield on purchased credit impaired
Balance at the beginning of period	0
Accretable yield at acquisition	788
Accretion	(170)
Disposals and other	0
Change in accretable yield	0
Balance at the end of period	$ 618