Note 7 - Loans (Detail) - Components of Loans in Consolidated Balance Sheets (USD $)	Sep. 30, 2012	Dec. 31, 2011
Type of Loans:
Gross Loans	$ 7,259,930,000	$ 7,059,212,000
Allowance for loan losses	(184,438,000)	(206,280,000)
Unamortized deferred loan fees	(9,036,000)	(8,449,000)
Total loans, net	7,066,456,000	6,844,483,000
Loans held for sale	0	760,000
Commercial Loans Member
Type of Loans:
Gross Loans	2,082,920,000	1,868,275,000
Residential Mortgage Loans [Member]
Type of Loans:
Gross Loans	1,073,880,000	972,262,000
Commercial Mortgage Loans [Member]
Type of Loans:
Gross Loans	3,704,777,000	3,748,897,000
Equity Lines [Member]
Type of Loans:
Gross Loans	199,403,000	214,707,000
Real Estate Construction Loans [Member]
Type of Loans:
Gross Loans	187,248,000	237,372,000
Installment And Other Loans Member
Type of Loans:
Gross Loans	$ 11,702,000	$ 17,699,000

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Publisher FASB

-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details