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Note 8 - Income Taxes (Details) - Reconciliation of Income Tax Expense (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Note 8 - Income Taxes (Details) - Reconciliation of Income Tax Expense [Line Items]          
Computed at the statutory rate (35%)       $ 6,880 $ 6,321
Increase (decrease) in taxes resulting from:          
State income taxes, net of federal tax benefit       460 508
Other differences, net       171 142
Actual tax provision 4,464 2,926 5,546 5,396 5,546
Tax Exempt Interest Income [Member]
         
Increase (decrease) in taxes resulting from:          
Tax exempt interest income       (1,868) (1,200)
Tax Exempt Earnings on Bank Owned Life Insurance [Member]
         
Increase (decrease) in taxes resulting from:          
Tax exempt earnings on BOLI       $ (247) $ (225)