Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Covered Assets And FDIC Loss Sharing Asset
Balance at beginning of period	$ 39,846	$ 96,354
Cash received from the FDIC	1,678	(3,119)
FDIC reimbursable losses, net	132	363
Amortization, net	(6,452)	(9,779)
Impairment	1,938	784
Sale of other real estate	(756)	(1,346)
Write-downs of other real estate	516	52
Other	(65)	(194)
Balance at end of period	$ 36,837	$ 83,115