Fair Value of Assets and Liabilities (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financial assets
Cash and cash equivalents	$ 132,456	$ 187,040
Investment securities, available-for-sale	3,721,377	3,683,005
Investment securities available-for-sale, Fair value	3,721,377	3,683,005
Loans held for sale	95,495	145,501
Loans receivable, net of ALLL	3,542,573	3,266,571
Accrued interest receivable	43,593	37,770
Non-marketable equity securities	49,752	48,812
Total financial assets	7,585,246	7,368,699
Financial liabilities
Deposits	5,358,197	5,364,461
FHLB advances	1,217,445	997,013
Repurchase agreements and other borrowed funds	308,513	299,540
Subordinated debentures	125,490	125,418
Accrued interest payable	3,824	4,675
Interest rate swap	1,270	16,832
Total financial liabilities	7,014,739	6,807,939
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets
Cash and cash equivalents, Fair value	132,456	187,040
Loans held for sale, Fair value	95,495	145,501
Accrued interest receivable, Fair value	43,593	37,770
Total financial assets, Fair value	271,544	370,311
Financial liabilities
Deposits, Fair value	3,813,660	3,585,126
Accrued interest payable, Fair value	3,824	4,675
Total financial liabilities, Fair value	3,817,484	3,589,801
Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Investment securities available-for-sale, Fair value	3,721,377	3,683,005
Loans receivable, net of ALLL, Fair value	3,457,402	3,184,987
Non-marketable equity securities, Fair value	49,752	48,812
Total financial assets, Fair value	7,228,531	6,916,804
Financial liabilities
Deposits, Fair value	1,610,300	1,789,134
FHLB advances, Fair value	1,237,320	1,027,101
Repurchase agreements and other borrowed funds, Fair value	308,513	299,540
Subordinated debentures, Fair value	78,062	70,895
Interest rate swap agreements, Fair value	1,270	16,832
Total financial liabilities, Fair value	3,235,465	3,203,502
Significant Unobservable Inputs (Level 3) [Member]
Financial assets
Loans receivable, net of ALLL, Fair value	181,191	186,201
Total financial assets, Fair value	$ 181,191	$ 186,201

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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The aggregate carrying amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market, or elected fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan).

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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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-Name Audit and Accounting Guide (AAG)

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