Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Statements of Cash Flows [Abstract]
Income taxes paid	$ 12,915		$ 13,920
Interest expense paid on deposits and borrowings	11,780		12,580
Noncash transfers from loans to other real estate	24,780	[1]	20,700	[1]
Assets acquired in business combination	0		1,849,929
Liabilities assumed in business combination	$ 0		$ 1,821,066

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