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Fair Value Information - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Carrying Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Total Assets	$ 2,473,353	$ 2,222,023
Carrying Value [Member] | Government Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	359,300	46,507
Carrying Value [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	887,598	888,000
Carrying Value [Member] | CMO's / REMIC's-residential [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	571,960	604,508
Carrying Value [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	625,429	652,037
Carrying Value [Member] | Other Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	5,100	10,474
Carrying Value [Member] | Investment securities - AFS [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	2,449,387	2,201,526
Carrying Value [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	23,966	20,497
Interest rate swaps	23,966	20,497
Level 1 [Member] | Government Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | CMO's / REMIC's-residential [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Other Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 1 [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps
Interest rate swaps
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	23,966	20,497
Total Assets	2,473,353	2,222,023
Interest rate swaps	23,966	20,497
Level 2 [Member] | Government Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	359,300	46,507
Level 2 [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	887,598	888,000
Level 2 [Member] | CMO's / REMIC's-residential [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	571,960	604,508
Level 2 [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	625,429	652,037
Level 2 [Member] | Other Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	5,100	10,474
Level 2 [Member] | Investment securities - AFS [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS	2,449,387	2,201,526
Level 2 [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps	23,966	20,497
Interest rate swaps	23,966	20,497
Level 3 [Member] | Government Agency [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | CMO's / REMIC's-residential [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Municipal bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Other Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities - AFS
Level 3 [Member] | Interest rate swaps [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Interest rate swaps
Interest rate swaps

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This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

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-Publisher FASB

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

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. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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