Acquisitions (Activity for Acquired Loans) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Activity for accretable yield includes contractually due interest of acquired loans
Balance at beginning of period	$ 32,610		$ 49,390
Additions (reductions)	4,493	[1]	(997)	[1]
Accretion recognized in interest income	(11,262)		(13,235)
Reclassification from nonaccretable difference	10,000		125
Balance at end of period	$ 35,841		$ 35,283

[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.