Foreclosed Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 NumberOfAssets	Jun. 30, 2011 NumberOfAssets
Summary of the activity in the balance of foreclosed assets
Beginning balance, net	$ 16,332	$ 9,913
Additions/transfers from loans	5,508	4,271
Dispositions/sales	(8,010)	(3,760)
Valuation adjustments	(1,087)	(1,087)
Ending balance, net	12,743	9,337
Ending valuation allowance	(2,313)	(1,636)
Ending number of foreclosed assets	62,000	58,000
Proceeds from sale of foreclosed assets	7,955	4,145
Gain (loss) on sale of foreclosed assets	(55)	385
Noncovered [Member]
Summary of the activity in the balance of foreclosed assets
Beginning balance, net	13,268	5,000
Additions/transfers from loans	4,875	4,271
Dispositions/sales	(7,371)	(2,914)
Valuation adjustments	(626)	(493)
Ending balance, net	10,146	5,864
Ending valuation allowance	(1,359)	(896)
Ending number of foreclosed assets	53,000	47,000
Proceeds from sale of foreclosed assets	7,272	3,167
Gain (loss) on sale of foreclosed assets	(99)	253
Covered [Member]
Summary of the activity in the balance of foreclosed assets
Beginning balance, net	3,064	4,913
Additions/transfers from loans	633
Dispositions/sales	(639)	(846)
Valuation adjustments	(461)	(594)
Ending balance, net	2,597	3,473
Ending valuation allowance	(954)	(740)
Ending number of foreclosed assets	9,000	11,000
Proceeds from sale of foreclosed assets	686	978
Gain (loss) on sale of foreclosed assets	$ 44	$ 132