Loans - Interest Recognized and Cash Basis Interest Earned on Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	$ 14,921	$ 14,762
Commercial
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	8,048
Commercial
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period		10,744
CRE | Real estate
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	6,433	3,507
Land and construction | Real estate
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period		24
Home equity | Real estate
Interest Recognized and Cash Basis Interest Earned on Impaired Loans
Average of impaired loans during the period	$ 440	$ 487