Loans Held for Investment - Accretable Yield Roll Forward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Accretable yield on purchased credit impaired
Balance at the beginning of period	$ 2,726
Additions	788
Accretion	(665)
Disposals	(27)
Reclassification from (to) nonaccretable difference	(743)
Balance at the end of period	2,079
Canyon National
Accretable yield on purchased credit impaired
Balance at the beginning of period	1,130
Additions	0
Accretion	(33)
Disposals	0
Reclassification from (to) nonaccretable difference	(351)
Balance at the end of period	746
IDPK
Accretable yield on purchased credit impaired
Balance at the beginning of period	1,596
Additions	0
Accretion	(38)
Disposals	0
Reclassification from (to) nonaccretable difference	(1,068)
Balance at the end of period	490
SCAF
Accretable yield on purchased credit impaired
Balance at the beginning of period	0
Additions	788
Accretion	(594)
Disposals	(27)
Reclassification from (to) nonaccretable difference	676
Balance at the end of period	$ 843