Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of cash flows specific transaction amounts [Abstract]
Income taxes paid		$ 778
Interest expense paid on deposits and borrowings	$ 13,902	7,190
Noncash transfers from loans to other real estate	$ 2,010	$ 1,766