Securities - Available for Sale Securities Unrealized Losses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	$ 63,298	$ 530,697
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	30	3,000
Available for sale securities, Losses 12 months or longer, Fair value	1,099	339
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	9	6
Available for sale securities, Total, Fair value	64,397	531,036
Available for sale securities, Total, Gross Unrealized Losses	39	3,006
Municipal Obligation [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	5,278	18,854
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	14	42
Available for sale securities, Total, Fair value	5,278	18,854
Available for sale securities, Total, Gross Unrealized Losses	14	42
Mortgage-backed securities [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	57,752	212,900
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	14	692
Available for sale securities, Losses 12 months or longer, Fair value	1,097	337
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	7	4
Available for sale securities, Total, Fair value	58,849	213,237
Available for sale securities, Total, Gross Unrealized Losses	21	696
CMOs [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value		296,860
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses		2,193
Available for sale securities, Total, Fair value		296,860
Available for sale securities, Total, Gross Unrealized Losses		2,193
Corporate debt securities [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value		398
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses		34
Available for sale securities, Total, Fair value		398
Available for sale securities, Total, Gross Unrealized Losses		34
Equity securities [Member]
Unrealized Loss And Fair Value Available For Sale Securities [Line Items]
Available for sale securities, Losses less than 12 months, Fair Value	268	1,685
Available for sale securities, Losses Less than 12 months, Gross Unrealized Losses	2	39
Available for sale securities, Losses 12 months or longer, Fair value	2	2
Available for sale securities, Losses 12 months or longer, Gross Unrealized Losses	2	2
Available for sale securities, Total, Fair value	270	1,687
Available for sale securities, Total, Gross Unrealized Losses	$ 4	$ 41

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Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

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Amount of the excess of amortized cost basis over fair value of securities in a loss position and categorized neither as held-to-maturity nor trading securities.

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- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

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

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-Name Accounting Standards Codification

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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 03-1

-Paragraph 21

-Subparagraph a(2)

-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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 320

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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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