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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
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
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 $ 3,063,975 $ 2,945,158 $ 2,548,024
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 661,432 655,409 532,391
Commercial Loan [Member] | Watch and 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 15,627 29,327 32,832
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 27,327 9,614 14,395
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 704,386 694,350 579,618
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 1,167,621 1,095,285 886,172
Commercial Real Estate Investment [Member] | Watch and 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 26,276 21,833 19,093
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 2,508 2,682 5,564
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 1,196,405 1,119,800 910,829
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 298,968 294,337 281,632
Commercial Real Estate Owner Occupied [Member] | Watch and 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 14,703 15,580 15,480
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 7,323 7,574 6,449
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 320,994 317,491 303,561
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 96,947 89,501 68,521
Residential Mortgage [Member] | Watch and 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 786 804 735
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 113 113  
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 97,846 90,418 69,256
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 106,170 107,415 105,857
Home Equity Line of Credit [Member] | Watch and 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 1,913 2,145 2,175
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 756 682 538
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 108,839 110,242 108,570
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 5,998 3,961 4,106
Consumer, Other [Member] | Watch and 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     11
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 60 70  
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 6,058 4,031 4,117
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 601,711 575,321 523,535
Construction Loans [Member] | Watch and 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 8,577 19,643 17,566
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 19,159 13,862 30,972
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 629,447 608,826 572,073
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 2,938,847 2,821,229 2,402,214
Watch and 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 67,882 89,332 87,892
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 $ 57,246 $ 34,597 $ 57,918