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Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Investment Securities [Line Items] |  |
Amortized Cost | $ 1,123,728 | $ 1,140,212
Gross Unrealized Gains | 36,743 | 35,050
Gross Unrealized Losses | (29,649) | (32,486)
Estimated Fair Value of Available for Sale | 1,130,822 | 1,142,776
Obligations of U.S. Government Agencies [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 29,200 |
Estimated Fair Value of Available for Sale | 33,400 |
Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 787,100 |
Estimated Fair Value of Available for Sale | 818,400 |
Obligations of States and Political Subdivisions [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 82 | 444
Gross Unrealized Gains | 5 | 15
Gross Unrealized Losses | 0 | 0
Estimated Fair Value of Available for Sale | 87 | 459
Corporate Securities [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 10,771 | 11,811
Gross Unrealized Gains | 373 | 162
Gross Unrealized Losses | 0 | (562)
Estimated Fair Value of Available for Sale | 11,144 | 11,411
Pooled Trust Preferred Collateralized Debt Obligations [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 52,696 | 54,762
Gross Unrealized Gains | 2 | 3
Gross Unrealized Losses | (29,647) | (31,785)
Estimated Fair Value of Available for Sale | 23,051 | 22,980
Debt Securities [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 1,121,868 | 1,138,352
Gross Unrealized Gains | 36,743 | 35,050
Gross Unrealized Losses | (29,649) | (32,486)
Estimated Fair Value of Available for Sale | 1,128,962 | 1,140,916
Mortgage Backed Securities - Residential [Member] | Obligations of U.S. Government Agencies [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 29,214 | 32,139
Gross Unrealized Gains | 4,141 | 4,061
Gross Unrealized Losses | 0 | (6)
Estimated Fair Value of Available for Sale | 33,355 | 36,194
Mortgage Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 786,945 | 771,196
Gross Unrealized Gains | 31,333 | 29,835
Gross Unrealized Losses | 0 | 0
Estimated Fair Value of Available for Sale | 818,278 | 801,031
Mortgage Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 164 | 193
Gross Unrealized Gains | 2 | 1
Gross Unrealized Losses | 0 | (1)
Estimated Fair Value of Available for Sale | 166 | 193
Other Government Sponsored Enterprises [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 241,996 | 267,807
Gross Unrealized Gains | 887 | 973
Gross Unrealized Losses | (2) | (132)
Estimated Fair Value of Available for Sale | 242,881 | 268,648
Equities [Member] |  |
Investment Securities [Line Items] |  |
Amortized Cost | 1,860 | 1,860
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value of Available for Sale | $ 1,860 | $ 1,860

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -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. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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