Loans - Interest Recognized and Cash Basis Interest Earned on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	$ 4,362	$ 5,428
Commercial
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	3,239	1,343
Consumer
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	2	4
CRE | Real estate
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	665	2,951
Land and construction | Real estate
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	197	216
Home equity | Real estate
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	$ 259	$ 914