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Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment $ 43,773 $ 34,597 $ 43,298
Collectively evaluated for impairment 3,388,775 2,910,561 2,753,542
Ending balance 3,432,548 2,945,158 2,796,840
Commercial Loan [Member]
      
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment 17,785 9,614 12,791
Collectively evaluated for impairment 780,704 684,736 669,622
Ending balance 798,489 694,350 682,413
Commercial Real Estate Investment [Member]
      
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment 2,710 2,682 3,238
Collectively evaluated for impairment 1,380,129 1,117,118 1,036,537
Ending balance 1,382,839 1,119,800 1,039,775
Commercial Real Estate Owner Occupied [Member]
      
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment 5,054 7,574 8,547
Collectively evaluated for impairment 332,368 309,917 325,531
Ending balance 337,422 317,491 334,078
Residential Mortgage [Member]
      
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment   113 113
Collectively evaluated for impairment 126,263 90,305 78,948
Ending balance 126,263 90,418 79,061
Home Equity Line of Credit [Member]
      
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment 745 682 570
Collectively evaluated for impairment 106,546 109,560 108,319
Ending balance 107,291 110,242 108,889
Consumer, Other [Member]
      
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment   70 45
Collectively evaluated for impairment 3,662 3,961 9,314
Ending balance 3,662 4,031 9,359
Construction Loans [Member]
      
Note 6 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans by Impairment Method [Line Items]      
Individually evaluated for impairment 17,479 13,862 17,994
Collectively evaluated for impairment 659,103 594,964 525,271
Ending balance $ 676,582 $ 608,826 $ 543,265