Acquisitions (Activity for Acquired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Activity for accretable yield includes contractually due interest of acquired loans
Balance at beginning of period	$ 32,610		$ 49,390
Additions (reductions)	821	[1]	(491)	[1]
Accretion recognized in interest income	(3,843)		(4,940)
Reclassification from nonaccretable difference	10,000		125
Balance at end of period	$ 39,588		$ 44,084

[1] Represents additions of 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.