Statements of Cash Flows (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
Statements of Cash Flows [Abstract]
Income taxes paid		$ 15,291	$ 13,205
Interest expense paid on deposits and borrowings		14,639	16,361
Noncash transfers from loans to other real estate	[1]	$ 26,196	$ 30,671

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