Acquisitions (Activity for Acquired Loans) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Activity for accretable yield includes contractually due interest of acquired loans
Balance at beginning of period	$ 32,610		$ 49,390
Additions (reductions)	2,333	[1]	(1,874)	[1]
Accretion recognized in interest income	(7,594)		(9,321)
Reclassification from nonaccretable difference	10,000		125
Balance at end of period	$ 37,349		$ 38,320

[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.