Loans Held for Investment - Purchased Credit Impaired Loans (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Loans Held for Investment
Total purchase credit impaired	$ 7,953
Commercial and industrial
Loans Held for Investment
Total purchase credit impaired	4,408
Commercial owner occupied
Loans Held for Investment
Total purchase credit impaired	1,622
Commercial non-owner occupied
Loans Held for Investment
Total purchase credit impaired	1,505
Other loans
Loans Held for Investment
Total purchase credit impaired	418
Canyon National
Loans Held for Investment
Total purchase credit impaired	1,483
Canyon National | Commercial and industrial
Loans Held for Investment
Total purchase credit impaired	87
Canyon National | Commercial owner occupied
Loans Held for Investment
Total purchase credit impaired	517
Canyon National | Commercial non-owner occupied
Loans Held for Investment
Total purchase credit impaired	879
Canyon National | Other loans
Loans Held for Investment
Total purchase credit impaired	0
IDPK
Loans Held for Investment
Total purchase credit impaired	785
IDPK | Commercial and industrial
Loans Held for Investment
Total purchase credit impaired	159
IDPK | Commercial owner occupied
Loans Held for Investment
Total purchase credit impaired	0
IDPK | Commercial non-owner occupied
Loans Held for Investment
Total purchase credit impaired	626
IDPK | Other loans
Loans Held for Investment
Total purchase credit impaired	0
SCAF
Loans Held for Investment
Total purchase credit impaired	5,685
SCAF | Commercial and industrial
Loans Held for Investment
Total purchase credit impaired	4,162
SCAF | Commercial owner occupied
Loans Held for Investment
Total purchase credit impaired	1,105
SCAF | Commercial non-owner occupied
Loans Held for Investment
Total purchase credit impaired	0
SCAF | Other loans
Loans Held for Investment
Total purchase credit impaired	$ 418