For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

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

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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 7: 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.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-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 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-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 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References+ Details

- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References+ Details

Securities (Details 3) (USD $)	12 Months Ended
Securities (Details 3) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Available-for-sale securities
Non-credit-related losses other-than-temporary impairment on available-for-sale securities	$ 4,200,000	$ 7,500,000
Impairment losses recognized in earnings on other-than-temporarily impaired securities	651,000	2,031,000	16,445,000
Credit related other-than-temporary impairment recognized in earnings
Fair value of total securities available-for-sale	7,571,901,000	5,720,675,000
Non-agency CMOs
Available-for-sale securities
Impairment losses recognized in earnings on other-than-temporarily impaired securities	651,000	1,738,000	4,409,000
Credit related other-than-temporary impairment recognized in earnings
Fair value of total securities available-for-sale	69,001,000	118,295,000
Variable rate non-agency CMOs
Credit related other-than-temporary impairment recognized in earnings
Fair value of total securities available-for-sale	41,400,000
Other-than-temporarily impaired securities	9,200,000
Fixed rate non-agency CMOs
Credit related other-than-temporary impairment recognized in earnings
Fair value of total securities available-for-sale	27,600,000
Collateralized debt obligations
Available-for-sale securities
Impairment losses recognized in earnings on other-than-temporarily impaired securities			9,282,000
Perpetual preferred stock
Available-for-sale securities
Impairment losses recognized in earnings on other-than-temporarily impaired securities		293,000	1,124,000
Equity securities and mutual funds
Available-for-sale securities
Impairment losses recognized in earnings on other-than-temporarily impaired securities			1,630,000
Credit related other-than-temporary impairment recognized in earnings
Fair value of total securities available-for-sale	1,227,000	10,436,000
Total debt securities
Credit related other-than-temporary impairment recognized in earnings
Balance, beginning of period	19,445,000	17,707,000
Subsequent credit-related impairment	651,000	1,712,000
Initial credit-related impairment		26,000
Balance, end of period	20,096,000	19,445,000
Fair value of total securities available-for-sale	$ 7,570,674,000	$ 5,710,239,000