Allowance for Loan and Lease Losses and Unfunded Loan Commitments and Letters of Credit (Analysis of Credit Quality of Noncovered Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2011		Dec. 31, 2010
Recorded Investment Noncovered Loans	$ 2,001,129	[1]	$ 1,927,191	[1]
Commercial Business [Member] | Secured Debt [Member]
Weighted- Average Risk Rating	4.94		4.96
Recorded Investment Noncovered Loans	799,676	[1]	757,372	[1]
Commercial Business [Member] | Unsecured Debt [Member]
Weighted- Average Risk Rating	4.27		4.23
Recorded Investment Noncovered Loans	41,568	[1]	41,175	[1]
Real Estate 1-4 Family [Member] | Residential RE Perm [Member]
Weighted- Average Risk Rating	4.94		4.96
Recorded Investment Noncovered Loans	51,259	[1]	49,436	[1]
Real Estate Commercial & Multifamily [Member] | Commercial RE Land [Member]
Weighted- Average Risk Rating	5.79		5.75
Recorded Investment Noncovered Loans	25,899	[1]	24,956	[1]
Real Estate Commercial & Multifamily [Member] | Income Property Multifamily Perm [Member]
Weighted- Average Risk Rating	5.05		5.07
Recorded Investment Noncovered Loans	483,465	[1]	406,711	[1]
Real Estate Commercial & Multifamily [Member] | Owner Occupied RE Perm [Member]
Weighted- Average Risk Rating	5.12		5.12
Recorded Investment Noncovered Loans	345,811	[1]	366,284	[1]
Construction 1-4 Family [Member] | Land & Acquisition [Member]
Weighted- Average Risk Rating	6.66		6.79
Recorded Investment Noncovered Loans	30,164	[1]	37,054	[1]
Construction 1-4 Family [Member] | Residential Construction [Member]
Weighted- Average Risk Rating	6.49		6.63
Recorded Investment Noncovered Loans	22,529	[1]	31,293	[1]
Construction Commercial & Multifamily [Member] | Income Property Multifamily Construction [Member]
Weighted- Average Risk Rating	5.94		6.38
Recorded Investment Noncovered Loans	8,932	[1]	18,296	[1]
Construction Commercial & Multifamily [Member] | Owner Occupied RE Construction [Member]
Weighted- Average Risk Rating	4.81		4.93
Recorded Investment Noncovered Loans	13,266	[1]	11,990	[1]
Consumer [Member]
Weighted- Average Risk Rating	4.39		4.31
Recorded Investment Noncovered Loans	$ 178,560	[1]	$ 182,624	[1]

[1] Recorded investment includes unpaid principal balance, net of charge-offs, unamortized deferred loan fees or costs, unamortized premiums or discounts and accrued interest.