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Note 6 - Loans and Allowance for Credit Losses (Details) - Loans and Leases by Credit Quality Indicator (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income $ 3,432,548 $ 2,945,158 $ 2,796,840
Commercial Loan [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 761,502 655,409 638,074
Commercial Loan [Member] | Watch and Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 19,202 29,327 31,638
Commercial Loan [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 17,785 9,614 12,701
Commercial Loan [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 798,489 694,350 682,413
Commercial Real Estate Investment [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 1,362,060 1,095,285 1,014,556
Commercial Real Estate Investment [Member] | Watch and Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 18,069 21,833 21,981
Commercial Real Estate Investment [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 2,710 2,682 3,238
Commercial Real Estate Investment [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 1,382,839 1,119,800 1,039,775
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 320,960 294,337 305,426
Commercial Real Estate Owner Occupied [Member] | Watch and Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 11,408 15,580 20,105
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 5,054 7,574 8,547
Commercial Real Estate Owner Occupied [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 337,422 317,491 334,078
Residential Mortgage [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 125,363 89,501 78,221
Residential Mortgage [Member] | Watch and Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 900 804 727
Residential Mortgage [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income   113 113
Residential Mortgage [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 126,263 90,418 79,061
Home Equity Line of Credit [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 104,601 107,415 106,073
Home Equity Line of Credit [Member] | Watch and Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 1,945 2,145 2,246
Home Equity Line of Credit [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 745 682 570
Home Equity Line of Credit [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 107,291 110,242 108,889
Consumer, Other [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 3,662 3,961 9,313
Consumer, Other [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income   70 46
Consumer, Other [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 3,662 4,031 9,359
Construction Loans [Member] | Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 650,679 575,321 506,542
Construction Loans [Member] | Watch and Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 8,424 19,643 18,729
Construction Loans [Member] | Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 17,479 13,862 17,994
Construction Loans [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 676,582 608,826 543,265
Pass [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 3,328,827 2,821,229 2,658,205
Watch and Special Mention [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 59,948 89,332 95,426
Substandard [Member]
      
Financing Receivable, Recorded Investment [Line Items]      
Loans And Leases Receivable Net Of Deferred Income $ 43,773 $ 34,597 $ 43,209