Statements of Cash Flows (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Statement of cash flows specific transaction amounts [Abstract]
Income taxes paid		$ 24,646	$ 15,291
Interest expense paid on deposits and borrowings		17,132	14,639
Noncash transfers from loans to other real estate	[1]	$ 21,972	$ 26,196

[1] Includes transfers from covered loans to covered other real estate.