Loans And Allowance For Loan Losses (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended			12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011		Jun. 30, 2010	Dec. 31, 2010
Total Loans	$ 11,249,053,000	$ 11,249,053,000			$ 4,957,164,000
Loans Receivable, Net	11,249,053,000	11,249,053,000			4,957,164,000
Covered loans refer to loans acquired		6,317,886,000	[1]
Fair value of loans acquired with a deterioration of credit quality	536,833,000	536,833,000
Recorded losses	95,373,000	95,373,000			107,739,000
Acquisition of covered loans		95.00%
Provision for loan losses, net		1,400,000
Unpaid principal balance for purchased loans	95,373,000	95,373,000			107,739,000
Fair value of collateral less cost, in days		120
Total restructured loans	18,600,000	18,600,000
Investments in impaired loans	21,788,000	21,788,000			11,952,000
Interest that would have been recognized on nonaccrual loans	1,500,000	2,900,000
Interest recovered on nonaccrual loans	200,000	700,000
Accruing loans		90
Percent of accruing loans		0.04%			0.03%
Payments of principal and interest		90
Loans held for sale	67,081,000	67,081,000			21,866,000
Gain on the sale of loans totaled		50,000		1,000,000
Restructured Commercial Loans [Member]
Total restructured loans	8,400,000	8,400,000
Cost Recovery Method [Member]
Fair value of loans acquired with a deterioration of credit quality	39,500,000	39,500,000			45,300,000
FDIC [Member]
Recorded losses	28,900,000	28,900,000
Purchased Loans [Member]
Unpaid principal balance for purchased loans	1,922,000,000	1,922,000,000			1,193,000,000
Mortgage Loans For Sale [Member]
Loans held for sale	31,200,000	31,200,000
Commercial Loans Held For Sale [Member]
Loans held for sale	$ 35,900,000	$ 35,900,000

[1] Acquired loans are recorded at fair value with no allowance brought forward in accordance with acquisition accounting.