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Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income $ 2,691,358 $ 2,493,095 $ 2,319,237
Commercial Loan [Member] | Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 590,451 495,072 478,785
Commercial Loan [Member] | Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 29,765 34,821 29,363
Commercial Loan [Member] | Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 16,407 15,170 8,328
Commercial Loan [Member] | Doubtful [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income   7 17
Commercial Loan [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 636,623 545,070 516,493
Commercial Real Estate Investment [Member] | Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 966,886 892,569 921,544
Commercial Real Estate Investment [Member] | Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 31,277 10,668 4,898
Commercial Real Estate Investment [Member] | Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 5,560 11,401 6,048
Commercial Real Estate Investment [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 1,003,723 914,638 932,490
Commercial Real Estate Owner Occupied [Member] | Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 284,507 275,864 285,057
Commercial Real Estate Owner Occupied [Member] | Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 18,248 13,270 19,768
Commercial Real Estate Owner Occupied [Member] | Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 8,580 8,723 2,585
Commercial Real Estate Owner Occupied [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 311,335 297,857 307,410
Residential Mortgage [Member] | Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 77,969 61,134 48,128
Residential Mortgage [Member] | Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 844 737  
Residential Mortgage [Member] | Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income     714
Residential Mortgage [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 78,813 61,871 48,842
Home Equity Line of Credit [Member] | Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 105,854 104,302 95,960
Home Equity Line of Credit [Member] | Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 2,150 2,032 1,586
Home Equity Line of Credit [Member] | Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 561 510 423
Home Equity Line of Credit [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 108,565 106,844 97,969
Consumer, Other [Member] | Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 7,970 4,230 4,673
Consumer, Other [Member] | Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income   12 46
Consumer, Other [Member] | Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 11 43 8
Consumer, Other [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 7,981 4,285 4,727
Construction Loans [Member] | Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 502,319 508,166 355,534
Construction Loans [Member] | Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 23,120 17,862 31,434
Construction Loans [Member] | Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 18,879 36,502 24,338
Construction Loans [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 544,318 562,530 411,306
Pass [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 2,535,956 2,341,337 2,189,681
Special Mention [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 105,404 79,402 87,095
Substandard [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income 49,998 72,349 42,444
Doubtful [Member]
      
Note 4 - Loans and Allowance for Credit Losses (Details) - Recorded Investment In The Company's Loans And Leases [Line Items]      
Loans And Leases Receivable Net Of Deferred Income   $ 7 $ 17