Other Real Estate Owned (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 item	Mar. 31, 2012 item
OREO
Balance at the beginning of the period	$ 32,248	$ 18,022
Additions	10,542	7,569
Write-downs	(1,599)	(1,288)
Sold	(4,745)	(2,922)
Balance at the end of the period	36,446	21,381
Number of properties uncovered	172	92
Covered OREO
Balance at the beginning of the period	34,257	65,849
Additions	6,186	14,491
Write-downs	(971)	(7,255)
Sold	(5,228)	(11,297)
Balance at the end of the period	34,244	61,788
Number of properties covered by loss share with the FDIC	231	764
Total
Balance at the beginning of the period	66,505	83,871
Additions	16,728	22,060
Write-downs	(2,570)	(8,543)
Sold	(9,973)	(14,219)
Balance at the end of the period	$ 70,690	$ 83,169
Number of properties held	403	856