Covered Assets and FDIC Loss-sharing Asset (Analysis and Allowance for Losses on Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Covered Loans	$ 798,125	$ 714,733
Allowance for Loan Losses	8,327	6,055
Valuation discount resulting from acquisition accounting	218,993	191,617
Covered loans, net	570,805	517,061
Commercial Business [Member]
Covered Loans	220,727	165,255
Weighted-Average Risk Rating	6.09	5.74
Allowance for Loan Losses	2,018	2,903
Real Estate One-To-Four Family [Member]
Covered Loans	84,724	68,700
Weighted-Average Risk Rating	5.33	4.77
Allowance for Loan Losses	1,071	1,013
Real Estate Commercial & Multifamily Residential [Member]
Covered Loans	346,406	341,063
Weighted-Average Risk Rating	5.90	5.70
Allowance for Loan Losses	4,293	821
Construction One-To-Four Family Residential[Member]
Covered Loans	55,928	39,754
Weighted-Average Risk Rating	7.40	7.29
Allowance for Loan Losses	205	98
Construction Commercial & Multifamily Residential [Member]
Covered Loans	30,034	41,624
Weighted-Average Risk Rating	7.15	6.79
Allowance for Loan Losses	134	469
Consumer [Member]
Covered Loans	60,306	58,337
Weighted-Average Risk Rating	5.07	4.49
Allowance for Loan Losses	$ 606	$ 751