Allowance for Non-Covered Loan Loss and Credit Quality (Non-Covered Loans Sold) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Non Covered Loans Sold [Line Items]
Total	$ 17,515	$ 4,428
Term & Multifamily [Member]
Non Covered Loans Sold [Line Items]
Total	2,850	3,652
Construction & Development [Member]
Non Covered Loans Sold [Line Items]
Total	3,515	0
Residential Development [Member]
Non Covered Loans Sold [Line Items]
Total	23	0
Term [Member]
Non Covered Loans Sold [Line Items]
Total	11,127	0
LOC & Other [Member]
Non Covered Loans Sold [Line Items]
Total	$ 0	$ 776