Note 9 - Fair Value Measurements (Detail) - Assets measured at fair value on a recurring basis (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Fair Value	$ 683,640	$ 671,484
Fair Value, Inputs, Level 1 [Member]
Fair Value	137,209	180,416
Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Fair Value	3,600	3,542
Fair Value, Inputs, Level 1 [Member] \| US Government-sponsored Enterprises Debt Securities [Member]
Fair Value	128,498	172,877
Fair Value, Inputs, Level 1 [Member] \| FHLMC And FNMA Stock [Member]
Fair Value	2,787	655
Fair Value, Inputs, Level 1 [Member] \| Other Securities [Member]
Fair Value	2,324	3,342
Fair Value, Inputs, Level 2 [Member]
Fair Value	546,431	491,068
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage Backed Securities [Member] \| Guaranteed By GNMA [Member]
Fair Value	39,011	43,557
Fair Value, Inputs, Level 2 [Member] \| Residential Mortgage Backed Securities [Member] \| Issued by FNMA and FHLMC [Member]
Fair Value	60,295	66,272
Fair Value, Inputs, Level 2 [Member] \| Commercial Mortgage Backed Securities [Member]
Fair Value	4,624	5,065
Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Federally Tax-Exempt - California [Member]
Fair Value	84,811	83,616
Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Federally Tax-Exempt - Other States [Member]
Fair Value	174,032	170,741
Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Taxable - California [Member]
Fair Value	1,586	6,276
Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member] \| Taxable - Other States [Member]
Fair Value	5,382	500
Fair Value, Inputs, Level 2 [Member] \| Residential Collateralized Mortgage Obligations [Member] \| Issued Or Guaranteed By FNMA, FHLMC, Or GNMA [Member]
Fair Value	48,657	18,010
Fair Value, Inputs, Level 2 [Member] \| Residential Collateralized Mortgage Obligations [Member] \| Collateralized Securities, Other [Member]
Fair Value	5,646	7,593
Fair Value, Inputs, Level 2 [Member] \| Asset-backed Securities [Member]
Fair Value	7,651	8,286
Fair Value, Inputs, Level 2 [Member] \| Domestic Corporate Debt Securities [Member]
Fair Value	112,777	79,191
Fair Value, Inputs, Level 2 [Member] \| Other Securities [Member]
Fair Value	1,959	1,961
US States and Political Subdivisions Debt Securities [Member] \| Federally Tax-Exempt - California [Member]
Fair Value	84,811	83,616
US States and Political Subdivisions Debt Securities [Member] \| Federally Tax-Exempt - Other States [Member]
Fair Value	174,032	170,741
US States and Political Subdivisions Debt Securities [Member] \| Taxable - California [Member]
Fair Value	1,586	6,276
US States and Political Subdivisions Debt Securities [Member] \| Taxable - Other States [Member]
Fair Value	5,382	500
Residential Mortgage Backed Securities [Member] \| Guaranteed By GNMA [Member]
Fair Value	39,011	43,557
Residential Mortgage Backed Securities [Member] \| Issued by FNMA and FHLMC [Member]
Fair Value	60,295	66,272
US Treasury Securities [Member]
Fair Value	3,600	3,542
US Government-sponsored Enterprises Debt Securities [Member]
Fair Value	128,498	172,877
US States and Political Subdivisions Debt Securities [Member]
Fair Value	265,811	261,133
Residential Mortgage Backed Securities [Member]
Fair Value	99,306	109,829
Residential Collateralized Mortgage Obligations [Member]
Fair Value	54,303	25,603
Residential Collateralized Mortgage Obligations [Member] \| Issued Or Guaranteed By FNMA, FHLMC, Or GNMA [Member]
Fair Value	48,657	18,010
Residential Collateralized Mortgage Obligations [Member] \| Collateralized Securities, Other [Member]
Fair Value	5,646	7,593
Commercial Mortgage Backed Securities [Member]
Fair Value	4,624	5,065
Asset-backed Securities [Member]
Fair Value	7,651	8,286
FHLMC And FNMA Stock [Member]
Fair Value	2,787	655
Domestic Corporate Debt Securities [Member]
Fair Value	112,777	79,191
Other Securities [Member]
Fair Value	$ 4,283	$ 5,303

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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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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 FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15E

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-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

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

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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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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

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Reference 10: 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=6379932&loc=d3e22054-111558

+ Details

- 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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