Loans Changes in the Carrying Amount and Accretable Yield for Covered Loans (Details) (Covered impaired loan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Covered impaired loan [Member]
Changes in the carrying amount of accretable yield for covered loans [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 51,945	$ 79,138	$ 51,945	$ 79,138	$ 53,655	$ 67,282	$ 81,758	$ 113,288
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net	284,566	447,799	284,566	447,799	316,481	403,692	537,257	762,386
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	(9,683)	(14,056)	(34,438)	(51,327)
Certain Loans Acquired in Transfer not Accounted for as Debt Securities Carrying Amount Accretion	9,683	14,056	34,438	51,327
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	8,684	12,745	20,290	28,726
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities F D I C Payments Received under Loss Sharing Agreement	(41,598)	(103,514)	(153,564)	(365,914)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	$ (711)	$ (1,309)	$ (1,189)	$ (11,549)