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Securities Available for Sale - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Investment Securities [Line Items]
Amortized Cost	$ 1,169,613,000	$ 1,140,212,000
Gross Unrealized Gains	30,650,000	35,050,000
Gross Unrealized Losses	(28,960,000)	(32,486,000)
Estimated Fair Value of Available for Sale	1,171,303,000	1,142,776,000
Obligations of States and Political Subdivisions [Member]
Investment Securities [Line Items]
Amortized Cost	82,000	444,000
Gross Unrealized Gains	4,000	15,000
Gross Unrealized Losses	0	0
Estimated Fair Value of Available for Sale	86,000	459,000
Corporate Securities [Member]
Investment Securities [Line Items]
Amortized Cost	6,703,000	11,811,000
Gross Unrealized Gains	288,000	162,000
Gross Unrealized Losses	0	(562,000)
Estimated Fair Value of Available for Sale	6,991,000	11,411,000
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Investment Securities [Line Items]
Amortized Cost	51,866,000	54,762,000
Gross Unrealized Gains	3,000	3,000
Gross Unrealized Losses	(28,496,000)	(31,785,000)
Estimated Fair Value of Available for Sale	23,373,000	22,980,000
Debt Securities [Member]
Investment Securities [Line Items]
Amortized Cost	1,167,754,000	1,138,352,000
Gross Unrealized Gains	30,534,000	35,050,000
Gross Unrealized Losses	(28,960,000)	(32,486,000)
Estimated Fair Value of Available for Sale	1,169,328,000	1,140,916,000
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government [Member]
Investment Securities [Line Items]
Amortized Cost	27,883,000	32,139,000
Gross Unrealized Gains	3,781,000	4,061,000
Gross Unrealized Losses	0	(6,000)
Estimated Fair Value of Available for Sale	31,664,000	36,194,000
Mortgage - Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Investment Securities [Line Items]
Amortized Cost	839,102,000	771,196,000
Gross Unrealized Gains	25,691,000	29,835,000
Gross Unrealized Losses	(392,000)	0
Estimated Fair Value of Available for Sale	864,401,000	801,031,000
Mortgage - Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Investment Securities [Line Items]
Amortized Cost	148,000	193,000
Gross Unrealized Gains	1,000	1,000
Gross Unrealized Losses	0	(1,000)
Estimated Fair Value of Available for Sale	149,000	193,000
Other Government - Sponsored Enterprises [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Investment Securities [Line Items]
Amortized Cost	241,970,000	267,807,000
Gross Unrealized Gains	766,000	973,000
Gross Unrealized Losses	(72,000)	(132,000)
Estimated Fair Value of Available for Sale	242,664,000	268,648,000
Equities [Member]
Investment Securities [Line Items]
Amortized Cost	1,859,000	1,860,000
Gross Unrealized Gains	116,000	0
Gross Unrealized Losses	0	0
Estimated Fair Value of Available for Sale	$ 1,975,000	$ 1,860,000

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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-Number 115

-Paragraph 19

-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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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-Publisher FASB

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-SubTopic 10

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-Paragraph 1

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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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-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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