Acquisitions (Activity for Acquired Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Activity for accretable yield includes contractually due interest of acquired loans
Balance at beginning of period	$ 49,390		$ 68,305
Additions, net of reductions	(29)	[1]	5,057	[1]
Accretion recognized in interest income	(16,876)		(23,972)
Reclassification from nonaccretable difference	125		0
Balance at end of period	$ 32,610		$ 49,390

[1] Represents additions in estimated contractual interest expected to be collected from acquired loans being renewed or extended, less reductions in contractual interest resulting from the early payoff of acquired loans.