Loans Purchased Credit Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loans Held for Investment
Total purchase credit impaired	$ 3,346	$ 1,601
Business loans: Commercial and industrial
Loans Held for Investment
Total purchase credit impaired	289	94
Business loans: Commercial owner occupied
Loans Held for Investment
Total purchase credit impaired	884	546
Real estate loans: Commercial non-owner occupied
Loans Held for Investment
Total purchase credit impaired	2,088	956
Real estate loans: One-to-four family
Loans Held for Investment
Total purchase credit impaired	$ 85	$ 5