Fair Value of Assets and Liabilities (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financial assets
Cash and cash equivalents	$ 172,399	$ 128,032
Investment securities, available-for-sale	3,586,355	3,126,743
Investment securities available-for-sale, Fair value	3,586,355	3,126,743
Loans held for sale	118,986	95,457
Loans receivable, net of ALLL	3,271,434	3,328,619
Accrued interest receivable	39,359	34,961
Non-marketable equity securities	50,363	49,694
Total financial assets	7,238,896	6,763,506
Financial liabilities
Deposits	5,203,097	4,821,213
FHLB advances	917,021	1,069,046
Repurchase agreements and other borrowed funds	424,988	268,638
Subordinated debentures	125,382	125,275
Accrued interest payable	4,654	5,825
Interest rate swap	17,352	8,906
Total financial liabilities	6,692,494	6,298,903
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Cash and cash equivalents, Fair value	172,399	128,032
Loans held for sale, Fair value	118,986	95,457
Accrued interest receivable, Fair value	39,359	34,961
Total financial assets, Fair value	330,744	258,450
Financial liabilities
Deposits, Fair value	3,420,961	3,132,261
Accrued interest payable, Fair value	4,654	5,825
Total financial liabilities, Fair value	3,425,615	3,138,086
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Investment securities available-for-sale, Fair value	3,586,355	3,126,743
Loans receivable, net of ALLL, Fair value	3,150,882	3,146,502
Non-marketable equity securities, Fair value	50,363	49,694
Total financial assets, Fair value	6,787,600	6,322,939
Financial liabilities
Deposits, Fair value	1,790,276	1,698,382
FHLB advances, Fair value	949,696	1,099,699
Repurchase agreements and other borrowed funds, Fair value	424,988	268,642
Interest rate swap agreements, Fair value	17,352	8,906
Total financial liabilities, Fair value	3,182,312	3,075,629
Significant Unobservable Inputs (Level 3) [Member]
Financial assets
Loans receivable, net of ALLL, Fair value	207,878	239,831
Total financial assets, Fair value	207,878	239,831
Financial liabilities
Subordinated debentures, Fair value	68,957	65,903
Total financial liabilities, Fair value	$ 68,957	$ 65,903

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days.

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